diff --git a/cado.c b/cado.c
index 6494bca..c2c99d7 100644
--- a/cado.c
+++ b/cado.c
@@ -30,6 +30,7 @@
 #include <capset_from_namelist.h>
 #include <read_conf.h>
 #include <set_ambient_cap.h>
+#include <inttypes.h>
 
 static void printcapset(uint64_t capset, char *indent) {
 	cap_value_t cap;
@@ -41,7 +42,7 @@ static void printcapset(uint64_t capset, char *indent) {
 		}
 	}
 	if (count > 1)
-		printf("%s   %016llx\n",indent,capset);
+		printf("%s   %016" PRIx64 "\n",indent,capset);
 }
 
 #define OPTSTRING "hqvs"
diff --git a/caprint.c b/caprint.c
index 8809dc1..6a0a1a2 100644
--- a/caprint.c
+++ b/caprint.c
@@ -27,6 +27,7 @@
 #include <getopt.h>
 #include <libgen.h>
 #include <sys/capability.h>
+#include <inttypes.h>
 
 char *tag="CapAmb:\t";
 uint64_t get_capamb(pid_t pid) {
@@ -46,7 +47,9 @@ uint64_t get_capamb(pid_t pid) {
 		if (c == tag[status]) {
 			status++;
 			if (status == target) {
-				fscanf(f,"%llx",&capamb);
+				int fields = 0;
+				if ((fields = fscanf(f,"%" PRIx64 "",&capamb)) != 1)
+					fprintf(stderr, "WARNING: fscanf on %s return %d fields.\n", filename, fields);
 				break;
 			}
 		} else
@@ -126,6 +129,8 @@ int main(int argc, char *argv[]) {
 		if (prompt) printf("#");
 		if (compact) printf("\n");
 		if (longlist && count > 1)
-			printf("   %016llx\n",capamb);
+			printf("   %016" PRIx64 "\n",capamb);
 	}
+
+	return 0;
 }
diff --git a/capset_from_namelist.c b/capset_from_namelist.c
index 8ce1229..14f52a9 100644
--- a/capset_from_namelist.c
+++ b/capset_from_namelist.c
@@ -51,7 +51,7 @@ static int addcap(char *name, uint64_t *capset) {
 int capset_from_namelist(char *namelist, uint64_t *capset) {
 	int rv=0;
 	char *onecap;
-	char *tmptok;
+	char *tmptok = NULL;
 	for (; (onecap=strtok_r(namelist,",",&tmptok)) != NULL; namelist=NULL)
 		rv |= addcap(onecap,capset);
 	return rv;
diff --git a/configure.ac b/configure.ac
index c093ce4..9821c18 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,7 +8,6 @@ AC_CONFIG_SRCDIR([pam_check.h])
 AC_CONFIG_HEADERS([config.h])
 
 # Checks for programs.
-AC_PROG_CXX
 AC_PROG_CC
 AC_PROG_INSTALL