diff --git a/api/gutil.cpp b/api/gutil.cpp
index 6a3fa80c18..2295fae35a 100755
--- a/api/gutil.cpp
+++ b/api/gutil.cpp
@@ -397,6 +397,7 @@ int read_ppm_file(char* name, int& w, int& h, unsigned char** arrayp) {
     int i;
 
     f = fopen(name, "rb");
+    if (!f) return -1;
     do {fgets(buf, 256, f);} while (buf[0] == '#');
     if (buf[0] != 'P') {
         return -1;
diff --git a/client/main.C b/client/main.C
index e518932739..928ecf7fa9 100644
--- a/client/main.C
+++ b/client/main.C
@@ -144,7 +144,9 @@ int main(int argc, char** argv) {
     signal(SIGHUP, quit_client);
     signal(SIGINT, quit_client);
     signal(SIGQUIT, quit_client);
+#ifdef SIGPWR
     signal(SIGPWR, quit_client);
+#endif
     signal(SIGTSTP, susp_client);
     signal(SIGCONT, resume_client);
 #endif