Hi, I’m writing a C extension and have successfully based my Makefile on existing templates. This conveniently hides the details of the full Makefile provided by "pg_config --pgxs”. Which variable would be the appropriate one to specify the ‘-std=c99’ compiler flag? I’ve tried many and still get warnings that this flag should suppress (specifically, "ISO C90 forbids mixed declarations and code”). These are the variables I currently define: EXTENSION DATA PGFILEDESC MODULE_big PG_CPPFLAGS (this one seemed like the right place) SHLIB_LINK OBJS PG_CONFIG PGXS A workaround has been: OBJS = file1.o file2.o CPPFLAGS+=-Wdeclaration-after-statement but it’s not exactly the same thing. Thanks, Demitri