Use AC_HEADER_MAJOR to find definitions of major, minor, makedev.

Note this requires either the following fix in autoconf:

http://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=e17a30e98

OR gnulib sys_types module plus gnulib
commit a512e041120e9012e69afa2f5c3adc196ec4999a (any gnulib more
recent than Sep 2016) which corrects the AC_HEADER_MAJOR macro in a
similar way.

configure.ac

@@ -42,6 +42,9 @@ AC_SYS_LARGEFILE
 dnl Enable GNU stuff.
 AC_USE_SYSTEM_EXTENSIONS
 
+dnl Which header file defines major, minor, makedev.
+AC_HEADER_MAJOR
+
 dnl Define the host CPU architecture (defines host_cpu).
 AC_CANONICAL_HOST
 

init/init.c

@@ -40,7 +40,13 @@
 #include <sys/mount.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
+
+#if MAJOR_IN_MKDEV
+#include <sys/mkdev.h>
+#elif MAJOR_IN_SYSMACROS
 #include <sys/sysmacros.h>
+/* else it's in sys/types.h, included above */
+#endif
 
 /* Maximum time to wait for the root device to appear (seconds).
  *

m4/gnulib-cache.m4

@@ -33,6 +33,7 @@
 gl_LOCAL_DIR([])
 gl_MODULES([
   fts
+  sys_types
 ])
 gl_AVOID([])
 gl_SOURCE_BASE([lib])

src/ext2fs-c.c

@@ -32,7 +32,13 @@
 #include <errno.h>
 #include <assert.h>
 #include <inttypes.h>
+
+#if MAJOR_IN_MKDEV
+#include <sys/mkdev.h>
+#elif MAJOR_IN_SYSMACROS
 #include <sys/sysmacros.h>
+/* else it's in sys/types.h, included above */
+#endif
 
 /* Inlining is broken in the ext2fs header file.  Disable it by
  * defining the following: