gil_release_version is:
/* begin */
1: #ifndef GIL_RELEASE_VERSION
2: #define GIL_RELEASE_VERSION
3: #endif
/* end */

unicode_support_version is:
/* begin */
1: #ifndef UNICODE_SUPPORT_VERSION
2: #define UNICODE_SUPPORT_VERSION
3: #endif
/* end */

have_library: checking for SQLConnect() in -ldb2... -------------------- yes

"gcc -o conftest -I/home/rakhil/ruby_exe/include/ruby-2.6.0/x86_64-linux -I/home/rakhil/ruby_exe/include/ruby-2.6.0/ruby/backward -I/home/rakhil/ruby_exe/include/ruby-2.6.0 -I. -I/home/rakhil/clidriver/include    -O3 -ggdb3 -Wall -Wextra -Wdeclaration-after-statement -Wdeprecated-declarations -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wrestrict -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 conftest.c  -L. -L/home/rakhil/ruby_exe/lib -Wl,-rpath,/home/rakhil/ruby_exe/lib -L/home/rakhil/clidriver/lib -Wl,-rpath,/home/rakhil/clidriver/lib -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/home/rakhil/ruby_exe/lib -L/home/rakhil/ruby_exe/lib -lruby-static -lz -lpthread -lrt -lrt -ldl -lcrypt -lm   -lm   -lc"
/home/rakhil/ruby_exe/lib/ruby/2.6.0/mkmf.rb:406: warning: Insecure world writable dir /work/rakhil in PATH, mode 040777
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

"gcc -o conftest -I/home/rakhil/ruby_exe/include/ruby-2.6.0/x86_64-linux -I/home/rakhil/ruby_exe/include/ruby-2.6.0/ruby/backward -I/home/rakhil/ruby_exe/include/ruby-2.6.0 -I. -I/home/rakhil/clidriver/include    -O3 -ggdb3 -Wall -Wextra -Wdeclaration-after-statement -Wdeprecated-declarations -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wrestrict -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 conftest.c  -L. -L/home/rakhil/ruby_exe/lib -Wl,-rpath,/home/rakhil/ruby_exe/lib -L/home/rakhil/clidriver/lib -Wl,-rpath,/home/rakhil/clidriver/lib -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/home/rakhil/ruby_exe/lib -L/home/rakhil/ruby_exe/lib -lruby-static -lz -lpthread -lrt -lrt -ldl -lcrypt -lm  -ldb2  -lm   -lc"
conftest.c: In function 't':
conftest.c:14:57: error: 'SQLConnect' undeclared (first use in this function)
 int t(void) { void ((*volatile p)()); p = (void ((*)()))SQLConnect; return !p; }
                                                         ^~~~~~~~~~
conftest.c:14:57: note: each undeclared identifier is reported only once for each function it appears in
conftest.c: At top level:
cc1: warning: unrecognized command line option '-Wno-self-assign'
cc1: warning: unrecognized command line option '-Wno-parentheses-equality'
cc1: warning: unrecognized command line option '-Wno-constant-logical-operand'
cc1: warning: unrecognized command line option '-Wno-cast-function-type'
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:     int (* volatile tp)(void)=(int (*)(void))&t;
 9:     printf("%d", (*tp)());
10:   }
11: 
12:   return 0;
13: }
14: int t(void) { void ((*volatile p)()); p = (void ((*)()))SQLConnect; return !p; }
/* end */

"gcc -o conftest -I/home/rakhil/ruby_exe/include/ruby-2.6.0/x86_64-linux -I/home/rakhil/ruby_exe/include/ruby-2.6.0/ruby/backward -I/home/rakhil/ruby_exe/include/ruby-2.6.0 -I. -I/home/rakhil/clidriver/include    -O3 -ggdb3 -Wall -Wextra -Wdeclaration-after-statement -Wdeprecated-declarations -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wrestrict -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 conftest.c  -L. -L/home/rakhil/ruby_exe/lib -Wl,-rpath,/home/rakhil/ruby_exe/lib -L/home/rakhil/clidriver/lib -Wl,-rpath,/home/rakhil/clidriver/lib -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/home/rakhil/ruby_exe/lib -L/home/rakhil/ruby_exe/lib -lruby-static -lz -lpthread -lrt -lrt -ldl -lcrypt -lm  -ldb2  -lm   -lc"
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:     int (* volatile tp)(void)=(int (*)(void))&t;
 9:     printf("%d", (*tp)());
10:   }
11: 
12:   return 0;
13: }
14: extern void SQLConnect();
15: int t(void) { SQLConnect(); return 0; }
/* end */

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

have_header: checking for gil_release_version... -------------------- yes

"gcc -E -I/home/rakhil/ruby_exe/include/ruby-2.6.0/x86_64-linux -I/home/rakhil/ruby_exe/include/ruby-2.6.0/ruby/backward -I/home/rakhil/ruby_exe/include/ruby-2.6.0 -I. -I/home/rakhil/clidriver/include    -O3 -ggdb3 -Wall -Wextra -Wdeclaration-after-statement -Wdeprecated-declarations -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wrestrict -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  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <gil_release_version>
/* end */

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

have_header: checking for unicode_support_version... -------------------- yes

"gcc -E -I/home/rakhil/ruby_exe/include/ruby-2.6.0/x86_64-linux -I/home/rakhil/ruby_exe/include/ruby-2.6.0/ruby/backward -I/home/rakhil/ruby_exe/include/ruby-2.6.0 -I. -I/home/rakhil/clidriver/include    -O3 -ggdb3 -Wall -Wextra -Wdeclaration-after-statement -Wdeprecated-declarations -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wrestrict -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  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <unicode_support_version>
/* end */

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