From d0a93670177f2b7691cc86d516e1576d05dc6547 Mon Sep 17 00:00:00 2001
From: Geremia <Geremia@users.noreply.github.com>
Date: Sat, 27 Feb 2016 23:56:29 -0700
Subject: [PATCH 1/2] "make example" builds example.c if libgcrypt present

using AM_PATH_LIBGCRYPT to check for libgcrypt

removed AC_MSG_RESULT in configure.ac; added phony "example" target in Makefile.am if libcrypt not found
---
 Makefile.am  | 11 +++++++++++
 README       |  3 ++-
 configure.ac | 14 ++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index 578acab..209262f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -50,3 +50,14 @@ dist_noinst_DATA = \
 	AUTHORS COPYING README \
 	example.c \
 	testinput.c
+
+if CAN_COMPILE_EXAMPLE
+EXTRA_PROGRAMS = example
+example_SOURCES = example.c
+example_LDADD = libblkmaker-$(LIBBLKMAKER_API_VERSION).la libblkmaker_jansson-$(LIBBLKMAKER_API_VERSION).la $(LIBGCRYPT_LIBS)
+example_CFLAGS = $(LIBGCRYPT_CFLAGS)
+else
+example:
+    @echo "libgcrypt is required to build the example, but was not found"
+.PHONY: example
+endif
diff --git a/README b/README
index 1f6f5bf..7c412f1 100644
--- a/README
+++ b/README
@@ -5,7 +5,8 @@ Example dependencies:
 	Jansson 2.1 (to read JSON from stdin)
 	libgcrypt (for SHA256)
 
-For usage, check out example.c
+For usage, check out example.c. Run "make example" to build it.
+
 Note that you must assign blkmk_sha256_impl to a function pointer:
 	bool mysha256(void *hash_out, const void *data, size_t datasz)
 hash_out must be able to overlap with data!
diff --git a/configure.ac b/configure.ac
index 67e3d9e..633105c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -51,4 +51,18 @@ PKG_CHECK_MODULES([libbase58],[libbase58])
 
 AC_CHECK_LIB([ws2_32], [strchr])
 
+#libgcrypt necessary to build example.c with "make example"
+#check for libgcrypt:
+m4_ifdef([AM_PATH_LIBGCRYPT], [
+	AM_PATH_LIBGCRYPT([],
+		[
+			[can_compile_example=yes]
+		],[
+			[compile_example=no]
+		])
+],[
+        m4_warn([syntax], [AM_PATH_LIBGCRYPT missing; CLI tool will not be available])
+])
+AM_CONDITIONAL([CAN_COMPILE_EXAMPLE], [test x$can_compile_example = xyes])
+
 AC_OUTPUT

From 2d822c6bbc81c24aa2ace77fff2a71f435b26e4b Mon Sep 17 00:00:00 2001
From: Luke Dashjr <luke-jr+git@utopios.org>
Date: Tue, 26 Jul 2016 03:20:08 +0000
Subject: [PATCH 2/2] Minor fixups for "make example"

---
 configure.ac | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 633105c..4671ca7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -51,17 +51,17 @@ PKG_CHECK_MODULES([libbase58],[libbase58])
 
 AC_CHECK_LIB([ws2_32], [strchr])
 
-#libgcrypt necessary to build example.c with "make example"
-#check for libgcrypt:
+dnl libgcrypt necessary to build example.c with "make example"
+dnl check for libgcrypt:
 m4_ifdef([AM_PATH_LIBGCRYPT], [
 	AM_PATH_LIBGCRYPT([],
 		[
-			[can_compile_example=yes]
+			can_compile_example=yes
 		],[
-			[compile_example=no]
+			can_compile_example=no
 		])
 ],[
-        m4_warn([syntax], [AM_PATH_LIBGCRYPT missing; CLI tool will not be available])
+	m4_warn([syntax], [AM_PATH_LIBGCRYPT missing; example will not be available])
 ])
 AM_CONDITIONAL([CAN_COMPILE_EXAMPLE], [test x$can_compile_example = xyes])