Which md5.h? Which libraries?

["Robert Cahn" <robertscahn@xxxxxxxxx>]

I find the following files on my F7 system:

/usr/include/pi-md5.h
/usr/include/neon/ne_md5.h
/usr/include/c++/4.1.2/gnu/javax/crypto/jce/mac/HMacMD5Spi.h
/usr/include/c++/4.1.2/gnu/java/security/hash/MD5.h
/usr/include/openssl/md5.h
/usr/include/pppd/md5.h
/usr/include/sasl/md5.h
/usr/include/php/ext/standard/md5.h

I am writing a small GTK+ program.  I need to add an MD5 computation.  My question is,
"Which MD5 include file goes with which library?"  There are too many libraries to plow through
one directory at a time.  

Best regards,
/Bob Cahn