When I attempt to compile the a program using the -pg in order to get profile 
information, I received the following error. 
 
gcc -pg -g -o performance performance.c  -I/usr/pkg/include/pgsql -pg -g  
-I/usr/pkg/include/pgsql -Wl,-R/usr/pkg/lib -L/usr/pkg/lib -lpq 
/usr/lib/libcrypto.so.1: undefined reference to `__setjmp14' 
/usr/lib/libcrypto.so.1: undefined reference to `times' 
/usr/lib/libcrypto.so.1: undefined reference to `SHA1Update' 
/usr/lib/libcrypto.so.1: undefined reference to `__longjmp14' 
/usr/lib/libcrypto.so.1: undefined reference to `SHA1Init' 
/usr/lib/libcrypto.so.1: undefined reference to `setvbuf' 
/usr/lib/libssl.so.2: undefined reference to `readdir' 
/usr/lib/libcrypt.so.0: undefined reference to `MD5Final' 
/usr/lib/libcrypto.so.1: undefined reference to `chmod' 
/usr/lib/libresolv.so.1: undefined reference to `getnameinfo' 
/usr/lib/libresolv.so.1: undefined reference to `vprintf' 
/usr/lib/libssl.so.2: undefined reference to `opendir' 
/usr/lib/libcrypto.so.1: undefined reference to `shutdown' 
/usr/lib/libcrypt.so.0: undefined reference to `MD5Init' 
/usr/lib/libcrypt.so.0: undefined reference to `MD5Update' 
/usr/lib/libcrypto.so.1: undefined reference to `SHA1Final' 
/usr/lib/libssl.so.2: undefined reference to `closedir' 
/usr/lib/libcrypto.so.1: undefined reference to `tcsetattr' 
/usr/lib/libcrypto.so.1: undefined reference to `__assert13' 
 
The question is do I need to link the program to a library in order to get it 
to work.