build-sys: use -f with ln -s

Parallel builds would sometimes try to recreate the link,
and fail since 'ln -s' would refuse to overwrite.

diff --git a/Makefile.am b/Makefile.am
index cfcca7c88be9ff6b306671ba48c00a0ea7e8442c..b6d330696af27c18a473a71547811d1f9e6e10fc 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -177,7 +177,7 @@ define move-to-rootlibdir
                $(MKDIR_P) $(DESTDIR)$(rootlibdir) && \
                so_img_name=$$(readlink $(DESTDIR)$(libdir)/$$libname) && \
                so_img_rel_target_prefix=$$(echo $(libdir) | sed 's,\(^/\|\)[^/][^/]*,..,g') && \
-               ln -sf $$so_img_rel_target_prefix$(rootlibdir)/$$so_img_name $(DESTDIR)$(libdir)/$$libname && \
+               $(LN_S) -f $$so_img_rel_target_prefix$(rootlibdir)/$$so_img_name $(DESTDIR)$(libdir)/$$libname && \
                mv $(DESTDIR)$(libdir)/$$libname.* $(DESTDIR)$(rootlibdir); \
        fi
 endef
@@ -3711,7 +3711,7 @@ man/%.html: man/%.xml man/custom-html.xsl
        $(XSLTPROC_PROCESS_HTML)
 
 define html-alias
-       $(AM_V_LN)$(LN_S) $(notdir $<) $@
+       $(AM_V_LN)$(LN_S) -f $(notdir $<) $@
 endef
 
 endif