build: Enable Gnulib conditional-dependencies.

This slightly improves configure time; may help more down the road if we
enable more modules.

diff --git a/m4/gnulib-cache.m4 b/m4/gnulib-cache.m4
index 78b24d9aabf42f8cbb0eb71a587a17afd55cce92..3b9685ccf6cec26296137afefa6bb31b95cfe546 100644 (file)
--- a/m4/gnulib-cache.m4
+++ b/m4/gnulib-cache.m4
@@ -27,7 +27,7 @@
 
 
 # Specification in the form of a command-line invocation:
-#   gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk.in --no-conditional-dependencies --libtool --macro-prefix=gl --no-vc-files getopt-gnu strcase
+#   gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk.in --conditional-dependencies --libtool --macro-prefix=gl --no-vc-files getopt-gnu strcase
 
 # Specification in the form of a few gnulib-tool.m4 macro invocations:
 gl_LOCAL_DIR([])
@@ -43,6 +43,7 @@ gl_DOC_BASE([doc])
 gl_TESTS_BASE([tests])
 gl_LIB([libgnu])
 gl_MAKEFILE_NAME([gnulib.mk.in])
+gl_CONDITIONAL_DEPENDENCIES
 gl_LIBTOOL
 gl_MACRO_PREFIX([gl])
 gl_PO_DOMAIN([])