Upstream didn't ship Makefile.am so we have to patch bits by hands.
$(SHELL) is needed to run libtool properly (contains bashisms).
LIBTOOL variable uses $(SHELL) in it's definition.

Gentoo-bug: http://bugs.gentoo.org/401329
Reported by: Anthony Parsons

--- libmikmod/Makefile.in
+++ libmikmod/Makefile.in
@@ -27,6 +27,7 @@ CC=@CC@
 INSTALL=@INSTALL@
 LIBTOOL=@LIBTOOL@
 MKINSTALLDIRS=${top_srcdir}/mkinstalldirs
+SHELL=@SHELL@
 
 DEFS=@DEFS@
 CFLAGS=@CFLAGS@ -Dunix