to Compile lib in c for external procedures Oracle

Hello,
I hace a system operative solaris11
Oracle 11.2.3

I  need to compile lib in c, but i never i have compiled in solaris, this libraries will be for Oracle.

iI have this command.

gcc -fPIC -c -o libl.o  libl.c, one library compiled well, but other library , show me errors as it;

i don't know, i shouldn't  do,  with the linkers.

nu_lib.c:268: error: conflicting types for 'Decimalizar'
nu_lib.c:113: error: previous declaration of 'Decimalizar' was here
nu_libs.c:268: error: conflicting types for 'Decimalizar'
nu_lib.c:113: error: previous declaration of 'Decimalizar' was here
nu_libs.c:313: error: conflicting types for 'SumaMod10'