I'm creating a library (say libraryA) that uses another library (say libraryB). In source for libraryA I've included the header file for libraryB. I've also added the directory path of libraryA and libraryB in ld.so.conf. I compile the source of libraryA as follows: gcc -c libraryAsource.c -o libraryAsource.o And then I create libraryA: ar rcs libraryA.a libraryAsource.o But when I use libraryA in an application (say testapp) it gives me an error: libraryA.a (libraryAsource.o): In function 'libraryAfunction': libraryAsource.c:(.text+0xe): undefined reference to 'libraryBfunction' It is funny that I don't get this error when I compile libraryA but only when I compile testapp that uses libraryA. I guess the problem lies with the way I'm creating libraryA, since libraryA uses libraryB. But I don't know how to solve the problem. Any ideas or suggestions please. -- View this message in context: http://www.nabble.com/Linking-a-library-and-source-file-into-another-library-tp17052050p17052050.html Sent from the gcc - Help mailing list archive at Nabble.com.