build: let sed use posix ERE instead of GNU extension
Use POSIX Extended Regular Expression (ERE) instead of the GNU extension
\| in the install-exec-hook. This makes it create the symlink properly
with busybox sed built with musl libc. It will silently create a broken
symlink otherwise.
Lucas De Marchi: fix up added newline.
diff --git a/Makefile.am b/Makefile.am
index 6679deb..60d05e4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -107,7 +107,7 @@
if test "$(libdir)" != "$(rootlibdir)"; then \
$(MKDIR_P) $(DESTDIR)$(rootlibdir) && \
so_img_name=$$(readlink $(DESTDIR)$(libdir)/libkmod.so) && \
- so_img_rel_target_prefix=$$(echo $(libdir) | sed 's,\(^/\|\)[^/][^/]*,..,g') && \
+ so_img_rel_target_prefix=$$(echo $(libdir) | sed -E 's,(^/|)[^/][^/]*,..,g') && \
ln -sf $$so_img_rel_target_prefix$(rootlibdir)/$$so_img_name $(DESTDIR)$(libdir)/libkmod.so && \
mv $(DESTDIR)$(libdir)/libkmod.so.* $(DESTDIR)$(rootlibdir); \
fi