diff --git a/dev/libs/musl/ympbuild b/dev/libs/musl/ympbuild
index 78fffef5..46051d8a 100644
--- a/dev/libs/musl/ympbuild
+++ b/dev/libs/musl/ympbuild
@@ -51,5 +51,12 @@ package(){
 	EOF
     chmod 755 "$DESTDIR"/usr/bin/musl-ldd
     install ../ldconfig "$DESTDIR"/usr/bin/musl-ldconfig
+    # write sys/cdefs.h header
+    {
+    echo '#ifdef __cplusplus'
+    echo '#define __BEGIN_DECLS extern "C" {'
+    echo '#define __END_DECLS }'
+    echo '#endif'
+    } > "$DESTDIR"/usr/include/musl/sys/cdefs.h
 }
 
diff --git a/sys/kernel/linux-headers/ympbuild b/sys/kernel/linux-headers/ympbuild
index 3e84c2d6..bfd2cfca 100644
--- a/sys/kernel/linux-headers/ympbuild
+++ b/sys/kernel/linux-headers/ympbuild
@@ -19,5 +19,10 @@ package(){
     # install headers (archlinux kerhel config used)
     ALLOWROOT=1 mklinux -f -o $DESTDIR -v $version -y 1 --no-build \
         -c "https://raw.githubusercontent.com/archlinux/svntogit-packages/packages/linux/trunk/config"
+    # symlink for musl
+    mkdir -p $DESTDIR/usr/include/musl
+    for name in $(ls $DESTDIR/usr/include/ | grep -v musl) ; do
+        ln -s ../$name $DESTDIR/usr/include/musl/$name
+    done
 }