Macro XT_PROG_XTC creates the file “foo” in the toplevel directory, which is not removed afterwards. Make distcheck will therefore fail with the message

ERROR: files left in build directory after distclean:

Submitted on 30 June 2005 at 12:06

STR-326, martin:
Humz, that’s pretty bad. It seems that this file was only created for debugging purposes: it is never used in the macro. In fact, the entire pkg-config invocation can be dropped.