Hi Marc, Here is a trick to get a list of all the #define's that one-or-more headers introduce into the translation unit (picking on Cocoa for the moment): echo '#include <Cocoa/Cocoa.h>' | gcc -E -dM -x objective-c - -o dM.e >From that dM.e list, a select #undef list could be used to to remove offending preprocessor defines. Bit of a kluge, but sometimes necessary to get code and assorted headers to play nice together. Sincerely, --Eljay