main/libressl: fix cross-compile

main/libressl/APKBUILD

@@ -10,7 +10,9 @@ url="http://www.libressl.org/"
 arch="all"
 license="custom"
 depends=""
-makedepends="linux-headers"
+makedepends_build=""
+makedepends_host="linux-headers"
+makedepends="$makedepends_host"
 replaces="openssl"
 subpackages="$pkgname-dbg $_namever-libcrypto:_libs $_namever-libssl:_libs
 	$_namever-libtls:_libs $pkgname-dev $pkgname-doc"
@@ -19,9 +21,11 @@ builddir="$srcdir/$pkgname-$pkgver"
 
 build() {
 	cd "$builddir"
+	CFLAGS="-L$CBUILDROOT/usr/lib $CFLAGS" \
 	./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
+		--with-sysroot=$CBUILDROOT \
 		--prefix=/usr \
 		--sysconfdir=/etc \
 		--mandir=/usr/share/man \