Make use of common ZP_LYNX_DOC macro.

Instead of reproducing the same code on each configure.ac use the
common macro.

2 files changed, 25 insertions, 18 deletions

diff --git a/configure.ac b/configure.ac
index 9cb5b11..a5d0804 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,24 +60,7 @@ if test "x$GCC" = "xyes" ; then
    CXXFLAGS="$CXXFLAGS -pipe -Wall -W"
 fi
 
-# LYNX documentation generation
-AC_ARG_ENABLE(lynx,
-        AS_HELP_STRING(--disable-lynx,Turn off lynx usage for documentation generation),
-[case "${enableval}" in
-  yes) lynx=yes ;;
-  no)  lynx=no ;;
-  *) AC_MSG_ERROR(bad value ${enableval} for --disable-lynx) ;;
-esac],[lynx=yes])
-
-if test x$lynx = xyes ; then
-   AC_CHECK_PROG(have_lynx, lynx, yes, no)
-
-   if test x$have_lynx = xno ; then
-     AC_MSG_ERROR([*** Sorry, you have to install lynx or use --disable-lynx ***])
-   fi
-fi
-
-AM_CONDITIONAL([USE_LYNX], [test "x$lynx" = xyes])
+ZP_LYNX_DOC
 
 IT_PROG_INTLTOOL([0.35.0])
 GETTEXT_PACKAGE=pavucontrol
diff --git a/m4/zp_lynx_doc.m4 b/m4/zp_lynx_doc.m4
new file mode 100644
index 0000000..955a6ca
--- /dev/null
+++ b/m4/zp_lynx_doc.m4
@@ -0,0 +1,24 @@
+dnl Macro for enabling LYNX-based documentation generation
+
+AC_DEFUN([ZP_LYNX_DOC], [
+  AC_ARG_ENABLE(lynx,
+     AS_HELP_STRING([--disable-lynx],
+        [Turn off lynx usage for documentation generation]),,
+     [enable_lynx=yes])
+
+  case "${enable_lynx}" in
+    yes)
+      AC_CHECK_PROG(have_lynx, lynx, yes, no)
+
+      if test x$have_lynx = xno ; then
+         AC_MSG_WARN([*** lynx not found, plain text README will not be built ***])
+      fi
+      ;;
+    no)
+      have_lynx=no ;;
+    *)
+      AC_MSG_ERROR(bad value ${enableval} for --disable-lynx) ;;
+  esac
+
+  AM_CONDITIONAL([USE_LYNX], [test "x$have_lynx" = xyes])
+])