office/pdfchain: Fix build on 15.0.

Signed-off-by: Andrew Clemons <andrew.clemons@gmail.com>

office/pdfchain/pdfchain.SlackBuild

@@ -79,6 +79,18 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
+# pdftk is a dependency, and needs the gcc package to build. If we installed
+# that and sourced gcc5.sh, pdfchain won't build. We check for that here and
+# unset the vars.
+if [ "$CC" = "gcc-5" ] ; then
+  unset CC
+  unset CPP
+  unset CXX
+  unset AR
+  unset NM
+  unset RANLIB
+fi
+
 CFLAGS="$SLKCFLAGS" \
 CXXFLAGS="$SLKCFLAGS -std=c++11" \
 ./configure \