configure.ac: Add -Wmissing-prototypes.

diff --git a/configure.ac b/configure.ac
index 86d4eb60e414e7befc80ac35eaf533f466bd008d..35f9d74df78b2019883899da7ad711d74298bf09 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -41,7 +41,7 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 
 # Enable more compiler warnings.
-CFLAGS="$CFLAGS -std=c99 -Wall -Wextra -pedantic"
+CFLAGS="$CFLAGS -std=c99 -Wall -Wextra -pedantic -Wmissing-prototypes"
 
 # Checks for programs.
 AC_PROG_CC