I am trying to compile a program on RedHat AS 4.0 that uses a 3rd party library that was compiled on RedHat AS 2.1. The library has calls to I think toupper and tolower because I am getting error about undefined reference __ctype_toupper and __ctype_tolower. In ctypes.h on RH AS 4.0 I see macros for tolower using __ctype_toupper_loc() and on a system that has RH 7.3 the macro is defined using __ctype_toupper. I have another application that required compat-libstdc++-296.2.96-132.7.2.i386 be installed. It run fine. So my question is what CC option do I need to use to use what ever compatibility libraries? Or do I need to load something else? Or am I just out of luck until the vendor creates a library that will work on RH AS 4.0? Thanks: Jack Allen -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list