src/Makefile.am: Fix "make distcheck".

protoc-c has a weird handling of files not in the CWD: They have to be
specified with the "-I" option _and_ you need to specify the full path
to the file.

diff --git a/src/Makefile.am b/src/Makefile.am
index 1891f7a..a30bc18 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1371,7 +1371,7 @@ EXTRA_DIST +=   collectd.conf.pod \
        fi
 
 pinba.pb-c.c pinba.pb-c.h: pinba.proto
-       protoc-c --c_out . pinba.proto
+       protoc-c -I$(srcdir) --c_out . $(srcdir)/pinba.proto
 
 install-exec-hook:
        $(mkinstalldirs) $(DESTDIR)$(sysconfdir)