diff --git a/configure.ac b/configure.ac
index 348d783..13100e9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,6 +20,10 @@ AX_CHECK_COMPILE_FLAG([-std=c11],
 # Other tools
 AC_PROG_RANLIB
 AM_PROG_AR
+AC_PROG_INSTALL
+AC_PROG_CPP
+AC_PROG_MKDIR_P
+AC_PROG_RANLIB
 
 # Checks for header files.
 AC_CHECK_HEADERS([assert.h math.h stdint.h stdlib.h stdbool.h stdio.h])
@@ -27,14 +31,13 @@ AC_CHECK_HEADERS([assert.h math.h stdint.h stdlib.h stdbool.h stdio.h])
 # Checks for typedefs, structures, and compiler characteristics.
 AC_CHECK_HEADER_STDBOOL
 AC_C_INLINE
-AC_TYPE_INT32_T
 AC_TYPE_SIZE_T
+AC_TYPE_UINT16_T
 AC_TYPE_UINT32_T
+AC_TYPE_UINT8_T
 
 # Checks for library functions.
 AC_FUNC_MALLOC
-AC_FUNC_REALLOC
-AC_CHECK_FUNCS([memmove memset mkdir pow strchr strdup strstr strtol])
 
 # User defined options: debug
 AC_ARG_ENABLE([debug],