Make fig2dev optional?

[Colin Davis]

Installing fig2dev is unfortunately rather difficult on OSX, since it has a lot of prerequisites, and is not bundled with homebrew.
Unfortunately, I didn't see an easy way to bypass creating these figures, other than manually editing the Makefile every time..

I added a check, which will look to see if fig2dev is installed. If not, it doesn't add the images to BUILT_SOURCES
There may be a cleaner way to do this, but this lets me build lib

There may well be a cleaner way to do this, but lets me build without fig2dev, while still running it if fig2dev is installed.

-CPD


https://gist.githubusercontent.com/e1ven/01244536540ae08c7dc1/raw/14b91133ddf0f616856afbab49d3251291606b5f/fig2dev.patch
From a038af5b9d747161f79ef0f28dfb848aa50fe81f Mon Sep 17 00:00:00 2001
From: Colin Davis <e1ven at e1ven.com>
Date: Tue, 8 Jul 2014 01:23:29 -0400
Subject: [PATCH] Make fig2dev optional

---
 configure.ac    |  2 ++
 doc/Makefile.am | 18 ++++++++++--------
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/configure.ac b/configure.ac
index c5952c7..58c276f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1334,6 +1334,8 @@ if test "$gcry_cv_cc_arm_arch_is_v6" = "yes" ; then
      [Defined if ARM architecture is v6 or newer])
 fi
 
+AC_CHECK_PROG([fig2dev], fig2dev, yes, no)
+AM_CONDITIONAL([FOUND_FIG2DEV], [test "x$fig2dev" = xyes])
 
 #
 # Check whether GCC inline assembler supports NEON instructions
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 30330bb..782ec6a 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -17,18 +17,20 @@
 # License along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 
-EXTRA_DIST = README.apichanges HACKING DCO \
-	     libgcrypt-modules.eps fips-fsm.eps \
-	     libgcrypt-modules.png fips-fsm.png \
-             libgcrypt-modules.pdf fips-fsm.pdf \
-	     yat2m.c
-
-DISTCLEANFILES = gcrypt.cps yat2m-stamp.tmp yat2m-stamp $(myman_pages)
-CLEANFILES = yat2m
 
+if FOUND_FIG2DEV
 BUILT_SOURCES = libgcrypt-modules.eps fips-fsm.eps \
                 libgcrypt-modules.png fips-fsm.png \
                 libgcrypt-modules.pdf fips-fsm.pdf
+else
+	BUILT_SOURCES = ""
+endif
+
+EXTRA_DIST = README.apichanges HACKING DCO \
+	     yat2m.c $(BUILT_SOURCES)
+
+DISTCLEANFILES = gcrypt.cps yat2m-stamp.tmp yat2m-stamp $(myman_pages)
+CLEANFILES = yat2m
 
 info_TEXINFOS = gcrypt.texi
 gcrypt_TEXINFOS = lgpl.texi gpl.texi libgcrypt-modules.fig fips-fsm.fig
-- 
2.0.1