diff --git a/Makefile b/Makefile
index 2a1a81c..77b07cd 100644
--- a/Makefile
+++ b/Makefile
@@ -37,7 +37,7 @@ man: docs/sowon.6.gz
 
 .PHONY: clean
 clean:
-	rm -r sowon build docs/sowon.6.gz
+	rm -rf sowon build docs/sowon.6.gz
 
 .PHONY: install
 install: all
diff --git a/src/common.c b/src/common.c
index b24b10d..6ee6b46 100644
--- a/src/common.c
+++ b/src/common.c
@@ -5,6 +5,7 @@
 #endif
 
 #include <math.h>
+#include <stdio.h>
 #include <time.h>
 
 #define FPS 60
diff --git a/src/png2c.c b/src/png2c.c
index 8b039c6..d103dd3 100644
--- a/src/png2c.c
+++ b/src/png2c.c
@@ -38,6 +38,7 @@ int main(int argc, char *argv[])
 
     printf("#ifndef PNG_%s_H_\n", name);
     printf("#define PNG_%s_H_\n", name);
+    printf("#include <stdint.h>\n");
     printf("size_t %s_width = %d;\n", name, x);
     printf("size_t %s_height = %d;\n", name, y);
     printf("uint32_t %s_data[] = {", name);