From: Michael Olbrich <m.olbrich@pengutronix.de>
Date: Wed, 2 Nov 2011 00:14:37 +0100
Subject: [PATCH] don't regen docs if perl is not found

If we're using a cvs snapshot which updates the source files, and
perl isn't installed yet, then we can't regen the docs.  Not a big
deal, so just whine a little and continue on our merry way.

This patch was taken from gentoo.
http://bugs.gentoo.org/60132

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
---
 manual/Makefile |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/manual/Makefile b/manual/Makefile
index 46dd430..db96bdf 100644
--- a/manual/Makefile
+++ b/manual/Makefile
@@ -106,9 +106,14 @@ dir-add.texi: xtract-typefun.awk $(texis)
 libm-err.texi: stamp-libm-err
 stamp-libm-err: libm-err-tab.pl $(wildcard $(foreach dir,$(sysdirs),\
 						     $(dir)/libm-test-ulps))
+ifneq ($(PERL),no)
 	pwd=`pwd`; \
 	$(PERL) $< $$pwd/.. > libm-err-tmp
 	$(move-if-change) libm-err-tmp libm-err.texi
+else
+	echo "Unable to rebuild math docs, no perl installed"
+	touch libm-err.texi
+endif
 	touch $@
 
 # Generate Texinfo files from the C source for the example programs.