[yelp-tools] Fix 'make pot' when srcdir != builddir

[Shaun McCance <shaunm src gnome org>]

commit c67421d646c9d1e6afc0d8095dd2a473c9881366
Author: Michael Terry <michael terry canonical com>
Date:   Thu Nov 1 09:20:05 2012 +0100

    Fix 'make pot' when srcdir != builddir
    
    https://bugzilla.gnome.org/show_bug.cgi?id=655350

 tools/yelp.m4 |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/tools/yelp.m4 b/tools/yelp.m4
index cb467a2..766c93b 100644
--- a/tools/yelp.m4
+++ b/tools/yelp.m4
@@ -52,7 +52,8 @@ all: $(_HELP_C_FILES) $(_HELP_C_EXTRA) $(_HELP_C_MEDIA) $(_HELP_LC_FILES) $(_HEL
 .PHONY: pot
 pot: $(_HELP_POTFILE)
 $(_HELP_POTFILE): $(_HELP_C_FILES) $(_HELP_C_EXTRA) $(_HELP_C_MEDIA)
-       $(AM_V_GEN)$(ITSTOOL) -o "[$]@" $(_HELP_C_FILES)
+       $(AM_V_GEN)if test -d "C"; then d=; else d="$(srcdir)/"; fi; \
+       $(ITSTOOL) -o "[$]@" $(foreach f,$(_HELP_C_FILES),"$${d}$(f)")
 
 .PHONY: repo
 repo: $(_HELP_POTFILE)