Heed advice of autoscan(1).

configure.ac

@@ -8,12 +8,28 @@ AM_INIT_AUTOMAKE([foreign])
 
 LT_INIT
 
+AC_CONFIG_MACRO_DIR([m4])
+AC_CONFIG_SRCDIR([mimetic.h])
+AC_CONFIG_HEADERS([config.h])
+
+# Checks for programs.
 AC_PROG_CC
 AC_PROG_LIBTOOL
 
-AC_CONFIG_MACRO_DIR([m4])
-AC_CONFIG_SRCDIR([mimetic.h])
-AM_CONFIG_HEADER([config.h])
+# Checks for libraries.
+
+# Checks for header files.
+AC_CHECK_HEADERS([limits.h stddef.h stdlib.h string.h])
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_HEADER_STDBOOL
+AC_TYPE_SIZE_T
+AC_CHECK_TYPES([ptrdiff_t])
+
+# Checks for library functions.
+AC_FUNC_MALLOC
+AC_FUNC_REALLOC
+AC_CHECK_FUNCS([floor memmove memset])
 
 AX_LAPACK