Usual fix for musl libc
--- src/systemd/src/basic/stdio-util.h.orig
+++ src/systemd/src/basic/stdio-util.h
@@ -19,7 +19,9 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#if defined(__GLIBC__)
 #include <printf.h>
+#endif
 #include <stdarg.h>
 #include <stdio.h>
 #include <sys/types.h>
--- src/systemd/src/basic/util.h.orig
+++ src/systemd/src/basic/util.h
@@ -46,6 +46,11 @@
 #include "missing.h"
 #include "time-util.h"
 
+#if !defined(__GLIBC__)
+typedef int (*__compar_fn_t) (const void*, const void*);
+typedef __compar_fn_t comparison_fn_t;
+#endif
+
 size_t page_size(void) _pure_;
 #define PAGE_ALIGN(l) ALIGN_TO((l), page_size())