Make use of common ZP_LYNX_DOC macro.

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

1 files changed, 24 insertions, 0 deletions

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])
+])