have_macro: checking for O_NONBLOCK in fcntl.h... -------------------- yes

"gcc -I../../../.ext/include/x86_64-linux -I../../.././include -I../../.././ext/io/nonblock    -O3 -ggdb3 -Wall -Wextra -Wdeprecated-declarations -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wwrite-strings -Wimplicit-fallthrough=0 -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable  -fPIC   -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <fcntl.h>
4: /*top*/
5: #ifndef O_NONBLOCK
6: # error
7: |:/ === O_NONBLOCK undefined === /:|
8: #endif
/* end */

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

have_macro: checking for F_GETFL in fcntl.h... -------------------- yes

"gcc -I../../../.ext/include/x86_64-linux -I../../.././include -I../../.././ext/io/nonblock    -O3 -ggdb3 -Wall -Wextra -Wdeprecated-declarations -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wwrite-strings -Wimplicit-fallthrough=0 -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable  -fPIC   -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <fcntl.h>
4: /*top*/
5: #ifndef F_GETFL
6: # error
7: |:/ === F_GETFL undefined === /:|
8: #endif
/* end */

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

extconf.h is:
/* begin */
1: #ifndef EXTCONF_H
2: #define EXTCONF_H
3: #endif
/* end */