[libpeas] Fix make check when gtkdoc is not enabled

[Garrett Regier <gregier src gnome org>]

commit 56c4102341ef6180a515cf94eedca7df40f5ff55
Author: Garrett Regier <garrettregier gmail com>
Date:   Thu Jan 22 17:59:25 2015 -0800

    Fix make check when gtkdoc is not enabled

 configure.ac               |    1 +
 docs/reference/Makefile.am |    4 ++++
 2 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f55bdbc..588f990 100644
--- a/configure.ac
+++ b/configure.ac
@@ -473,6 +473,7 @@ dnl Documentation
 dnl ================================================================
 
 GTK_DOC_CHECK([1.11],[--flavour no-tmpl])
+AM_CONDITIONAL(ENABLE_GTK_DOC, test "x$enable_gtk_doc" = "xyes")
 
 AC_ARG_ENABLE(doc-cross-references,
               AS_HELP_STRING([--disable-doc-cross-references],
diff --git a/docs/reference/Makefile.am b/docs/reference/Makefile.am
index 45e3f90..05e841e 100644
--- a/docs/reference/Makefile.am
+++ b/docs/reference/Makefile.am
@@ -101,6 +101,9 @@ include $(top_srcdir)/gtk-doc.make
 EXTRA_DIST += \
        version.xml.in
 
+
+if ENABLE_GTK_DOC
+
 TESTS_ENVIRONMENT = \
        SRCDIR=$(abs_srcdir)                            \
        BUILDDIR=$(abs_builddir)                        \
@@ -110,3 +113,4 @@ TESTS_ENVIRONMENT = \
 check-local: $(GTKDOC_CHECK)
        @$(TESTS_ENVIRONMENT) $(GTKDOC_CHECK)
 
+endif