have_type: checking for DBM in ndbm.h... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: ndbm.h: No such file or directory
 #include <ndbm.h>
          ^~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <ndbm.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db.h: No such file or directory
 #include <db.h>
          ^~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db2/db.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db2/db.h: No such file or directory
 #include <db2/db.h>
          ^~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db2/db.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db2.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db2.h: No such file or directory
 #include <db2.h>
          ^~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db2.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db.h: No such file or directory
 #include <db.h>
          ^~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db1/ndbm.h... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: db1/ndbm.h: No such file or directory
 #include <db1/ndbm.h>
          ^~~~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db1/ndbm.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db1.h... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: db1.h: No such file or directory
 #include <db1.h>
          ^~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db1.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in ndbm.h... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: ndbm.h: No such file or directory
 #include <ndbm.h>
          ^~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <ndbm.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db5/db.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db5/db.h: No such file or directory
 #include <db5/db.h>
          ^~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db5/db.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db5.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db5.h: No such file or directory
 #include <db5.h>
          ^~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db5.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db.h: No such file or directory
 #include <db.h>
          ^~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db4/db.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db4/db.h: No such file or directory
 #include <db4/db.h>
          ^~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db4/db.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db4.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db4.h: No such file or directory
 #include <db4.h>
          ^~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db4.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db.h: No such file or directory
 #include <db.h>
          ^~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db3/db.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db3/db.h: No such file or directory
 #include <db3/db.h>
          ^~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db3/db.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db3.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db3.h: No such file or directory
 #include <db3.h>
          ^~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db3.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in db.h with -DDB_DBM_HSEARCH... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC  -DDB_DBM_HSEARCH -c conftest.c"
conftest.c:3:10: fatal error: db.h: No such file or directory
 #include <db.h>
          ^~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <db.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_library: checking for main() in -lgdbm... -------------------- no

"gcc -o conftest -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC conftest.c  -L. -L../.. -L. -fstack-protector -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/usr/local/rvm/rubies/ruby-2.3.8/lib -L/usr/local/rvm/rubies/ruby-2.3.8/lib -lruby-static -lgdbm  -lpthread -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:13:43: warning: cast between incompatible function types from ‘int (*)(int,  char **)’ to ‘void (*)()’ [-Wcast-function-type]
 int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return !p; }
                                           ^
/usr/bin/ld: cannot find -lgdbm
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: extern int t(void);
 5: int main(int argc, char **argv)
 6: {
 7:   if (argc > 1000000) {
 8:     printf("%p", &t);
 9:   }
10: 
11:   return 0;
12: }
13: int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return !p; }
/* end */

"gcc -o conftest -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC conftest.c  -L. -L../.. -L. -fstack-protector -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/usr/local/rvm/rubies/ruby-2.3.8/lib -L/usr/local/rvm/rubies/ruby-2.3.8/lib -lruby-static -lgdbm  -lpthread -ldl -lcrypt -lm   -lc"
conftest.c:13:13: error: conflicting types for ‘main’
 extern void main();
             ^~~~
conftest.c:5:5: note: previous definition of ‘main’ was here
 int main(int argc, char **argv)
     ^~~~
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: extern int t(void);
 5: int main(int argc, char **argv)
 6: {
 7:   if (argc > 1000000) {
 8:     printf("%p", &t);
 9:   }
10: 
11:   return 0;
12: }
13: extern void main();
14: int t(void) { main(); return 0; }
/* end */

--------------------

have_library: checking for main() in -lgdbm... -------------------- no

"gcc -o conftest -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC conftest.c  -L. -L../.. -L. -fstack-protector -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/usr/local/rvm/rubies/ruby-2.3.8/lib -L/usr/local/rvm/rubies/ruby-2.3.8/lib -lruby-static -lgdbm  -lpthread -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:13:43: warning: cast between incompatible function types from ‘int (*)(int,  char **)’ to ‘void (*)()’ [-Wcast-function-type]
 int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return !p; }
                                           ^
/usr/bin/ld: cannot find -lgdbm
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: extern int t(void);
 5: int main(int argc, char **argv)
 6: {
 7:   if (argc > 1000000) {
 8:     printf("%p", &t);
 9:   }
10: 
11:   return 0;
12: }
13: int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return !p; }
/* end */

"gcc -o conftest -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC conftest.c  -L. -L../.. -L. -fstack-protector -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/usr/local/rvm/rubies/ruby-2.3.8/lib -L/usr/local/rvm/rubies/ruby-2.3.8/lib -lruby-static -lgdbm  -lpthread -ldl -lcrypt -lm   -lc"
conftest.c:13:13: error: conflicting types for ‘main’
 extern void main();
             ^~~~
conftest.c:5:5: note: previous definition of ‘main’ was here
 int main(int argc, char **argv)
     ^~~~
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: extern int t(void);
 5: int main(int argc, char **argv)
 6: {
 7:   if (argc > 1000000) {
 8:     printf("%p", &t);
 9:   }
10: 
11:   return 0;
12: }
13: extern void main();
14: int t(void) { main(); return 0; }
/* end */

--------------------

have_library: checking for main() in -lgdbm... -------------------- no

"gcc -o conftest -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC conftest.c  -L. -L../.. -L. -fstack-protector -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/usr/local/rvm/rubies/ruby-2.3.8/lib -L/usr/local/rvm/rubies/ruby-2.3.8/lib -lruby-static -lgdbm  -lpthread -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:13:43: warning: cast between incompatible function types from ‘int (*)(int,  char **)’ to ‘void (*)()’ [-Wcast-function-type]
 int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return !p; }
                                           ^
/usr/bin/ld: cannot find -lgdbm
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: extern int t(void);
 5: int main(int argc, char **argv)
 6: {
 7:   if (argc > 1000000) {
 8:     printf("%p", &t);
 9:   }
10: 
11:   return 0;
12: }
13: int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return !p; }
/* end */

"gcc -o conftest -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC conftest.c  -L. -L../.. -L. -fstack-protector -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/usr/local/rvm/rubies/ruby-2.3.8/lib -L/usr/local/rvm/rubies/ruby-2.3.8/lib -lruby-static -lgdbm  -lpthread -ldl -lcrypt -lm   -lc"
conftest.c:13:13: error: conflicting types for ‘main’
 extern void main();
             ^~~~
conftest.c:5:5: note: previous definition of ‘main’ was here
 int main(int argc, char **argv)
     ^~~~
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: extern int t(void);
 5: int main(int argc, char **argv)
 6: {
 7:   if (argc > 1000000) {
 8:     printf("%p", &t);
 9:   }
10: 
11:   return 0;
12: }
13: extern void main();
14: int t(void) { main(); return 0; }
/* end */

--------------------

have_type: checking for DBM in gdbm-ndbm.h... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: gdbm-ndbm.h: No such file or directory
 #include <gdbm-ndbm.h>
          ^~~~~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <gdbm-ndbm.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in gdbm/ndbm.h... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: gdbm/ndbm.h: No such file or directory
 #include <gdbm/ndbm.h>
          ^~~~~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <gdbm/ndbm.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in ndbm.h... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: ndbm.h: No such file or directory
 #include <ndbm.h>
          ^~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <ndbm.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in qdbm/relic.h... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: qdbm/relic.h: No such file or directory
 #include <qdbm/relic.h>
          ^~~~~~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <qdbm/relic.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

have_type: checking for DBM in relic.h... -------------------- no

"gcc -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/dbm     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC   -c conftest.c"
conftest.c:3:10: fatal error: relic.h: No such file or directory
 #include <relic.h>
          ^~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <relic.h>
4: 
5: /*top*/
6: typedef DBM conftest_type;
7: int conftestval[sizeof(conftest_type)?1:-1];
/* end */

--------------------

Failed to configure dbm. It will not be installed.