package configuration for openssl
cflags: -IC:/msys/1.0/local/include  
ldflags: -LC:/msys/1.0/local/lib
libs: -lssl -lcrypto  

have_library: checking for main() in -lcrypto... -------------------- yes

"gcc -o conftest -I../../../.ext/include/x64-mingw32 -I../../.././include -I../../.././ext/digest/rmd160 -I../../.././ext/digest/rmd160/..  -D_FILE_OFFSET_BITS=64  -O3 -finline-functions -D__USE_MINGW_ANSI_STDIO -IC:/msys/1.0/local/include   conftest.c  -L. -L../../.. -L.  -LC:/msys/1.0/local/lib     -lssl -lcrypto   -lx64-msvcrt-ruby191-static -lcrypto  -lssl -lcrypto   -lshell32 -lws2_32 -limagehlp  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: 
6: /*top*/
7: int main() {return 0;}
8: extern int t(void);
9: int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
/* end */

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

have_header: checking for openssl/ripemd.h... -------------------- yes

"gcc -E -I../../../.ext/include/x64-mingw32 -I../../.././include -I../../.././ext/digest/rmd160 -I../../.././ext/digest/rmd160/..  -D_FILE_OFFSET_BITS=64  -O3 -finline-functions -D__USE_MINGW_ANSI_STDIO -IC:/msys/1.0/local/include    conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <openssl/ripemd.h>
/* end */

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

have_header: checking for sys/cdefs.h... -------------------- yes

"gcc -E -I../../../.ext/include/x64-mingw32 -I../../.././include -I../../.././ext/digest/rmd160 -I../../.././ext/digest/rmd160/..  -D_FILE_OFFSET_BITS=64  -O3 -finline-functions -D__USE_MINGW_ANSI_STDIO -IC:/msys/1.0/local/include    conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <sys/cdefs.h>
/* end */

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

extconf.h is:
/* begin */
1: #ifndef EXTCONF_H
2: #define EXTCONF_H
3: #define NDEBUG 1
4: #define HAVE_CONFIG_H 1
5: #define HAVE_OPENSSL_RIPEMD_H 1
6: #define HAVE_SYS_CDEFS_H 1
7: #endif
/* end */