build: Define builddir and abs_srcdir when they are missing.

RHEL 5-era autoconf did not define these, so define them manually
when they are missing.

Define builddir as '.'  The scripts require this.  It won't work
in the srcdir != builddir case, but we don't care about that for
RHEL 5.

This commit also moves the builddir / abs_srcdir variable setting
above the include of subdir-rules.mk, in case that include uses
these variables.

Useful script:

  for f in $(find -name Makefile.am | xargs fgrep '$(abs_srcdir)' -l) ; do
    if ! grep -q '^abs_srcdir' $f; then
      echo missing in $f
    fi
  done

1 files changed, 6 insertions, 0 deletions

diff --git a/resize/Makefile.am b/resize/Makefile.am
index 00f5e350..8d87ab97 100644
--- a/resize/Makefile.am
+++ b/resize/Makefile.am
@@ -15,6 +15,12 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
+# Old RHEL 5 autoconf doesn't have builddir.
+builddir ?= .
+
+# Old RHEL 5 autoconf doesn't have abs_srcdir.
+abs_srcdir ?= $(shell cd $(top_srcdir)/resize && pwd)
+
 include $(top_srcdir)/subdir-rules.mk
 
 EXTRA_DIST = \