musl: recipe update

Allows prefixed builds.

musl/recipe.spec

@@ -2,25 +2,48 @@ name: musl
 version: 1.1.23
 release: 3
 sources: https://www.musl-libc.org/releases/musl-%{version}.tar.gz
-options:
+
-	- configure: --prefix=/usr --libdir=/lib --syslibdir=/lib --enable-shared --enable-static
+# Edit this if you somehow need to build a prefixed version of musl.
+prefix: /
+
+@configure
+	cd %{name}-%{version}
+
+	libdir=/lib
+	prefix=/usr/weirdos
+	if [ "%{prefix}" != "/" ]; then
+		prefix="%{prefix}"
+		libdir="%{prefix}/lib"
+	fi
+
+	./configure \
+		--prefix=$prefix \
+		--libdir=$libdir \
+		--syslibdir=$libdir \
+		--enable-shared \
+		--enable-static
 
 @install
 	cd %{name}-%{version}
 
+	libdir=/lib
+	if [ "%{prefix}" != "/" ]; then
+		libdir="%{prefix}/lib"
+	fi
+
 	make DESTDIR="%{pkg}" install
 
 	# FIXME: This’ll have to eventually be more automated.
 	# FIXME: That path has to be edited on other architectures.
 	mkdir -p %{pkg}/etc
 	{
-		echo /lib
+		echo $libdir
 		echo /usr/weirdos/lib
 		echo /usr/bad/lib
 		echo /usr/local/lib
 	} > %{pkg}/etc/ld-musl-x86_64.path
 
 	for lib in libm libpthread librt libdl; do
-		ln -s /lib/libc.so "%{pkg}/lib/${lib}.so"
+		ln -s $libdir/libc.so "%{pkg}$libdir/${lib}.so"
 	done