find_executable: checking for pg_config... -------------------- no

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

find_header: checking for libpq-fe.h... -------------------- no

"gcc -o conftest -I/usr/local/rvm/rubies/ruby-2.4.10/include/ruby-2.4.0/x86_64-linux -I/usr/local/rvm/rubies/ruby-2.4.10/include/ruby-2.4.0/ruby/backward -I/usr/local/rvm/rubies/ruby-2.4.10/include/ruby-2.4.0 -I.    -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wno-tautological-compare -Wno-parentheses-equality -Wno-constant-logical-operand -Wno-self-assign -Wunused-variable -Wimplicit-int -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat -Wsuggest-attribute=noreturn -Wsuggest-attribute=format -Wimplicit-fallthrough=0  -fPIC conftest.c  -L. -L/usr/local/rvm/rubies/ruby-2.4.10/lib -Wl,-rpath,/usr/local/rvm/rubies/ruby-2.4.10/lib -L. -fstack-protector -rdynamic -Wl,-export-dynamic     -Wl,-rpath,'/../lib' -Wl,-rpath,'/../lib' -lruby  -lpthread -ldl -lcrypt -lm   -lc"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

"gcc -E -I/usr/local/rvm/rubies/ruby-2.4.10/include/ruby-2.4.0/x86_64-linux -I/usr/local/rvm/rubies/ruby-2.4.10/include/ruby-2.4.0/ruby/backward -I/usr/local/rvm/rubies/ruby-2.4.10/include/ruby-2.4.0 -I.    -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wno-tautological-compare -Wno-parentheses-equality -Wno-constant-logical-operand -Wno-self-assign -Wunused-variable -Wimplicit-int -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat -Wsuggest-attribute=noreturn -Wsuggest-attribute=format -Wimplicit-fallthrough=0  -fPIC  conftest.c -o conftest.i"
conftest.c:3:10: fatal error: libpq-fe.h: No such file or directory
 #include <libpq-fe.h>
          ^~~~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <libpq-fe.h>
/* end */

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