diff --git a/fuse.spec b/fuse.spec
index cef88e3..e211885 100644
--- a/fuse.spec
+++ b/fuse.spec
@@ -13,6 +13,7 @@ Source0:	https://github.com/libfuse/libfuse/archive/%{name}-%{fuse2ver}.tar.gz
 #fuse3 sources
 Source1:	https://github.com/libfuse/libfuse/archive/%{name}-%{fuse3ver}.tar.gz
 Source2:	%{name}.conf
+Source3:	printsize.c
 
 Patch1:		fuse-3.0.0-More-parentheses.patch
 Patch2:		fuse-0001-More-parentheses.patch
@@ -101,6 +102,11 @@ Common files for FUSE v2 and FUSE v3.
 %prep
 %setup -q -T -c -n fuse2and3 -a0 -a1 
 
+cp %{SOURCE3} .
+gcc -o printsize printsize.c
+echo "%{_arch}"
+./printsize
+
 # fuse 3
 pushd lib%{name}-%{name}-%{fuse3ver}
 ./makeconf.sh
diff --git a/printsize.c b/printsize.c
new file mode 100644
index 0000000..bc0f629
--- /dev/null
+++ b/printsize.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <stdint.h>
+
+void main() {
+	int sizeof_off_t = sizeof(off_t);
+	int sizeof_uint64_t = sizeof(uint64_t);
+	int sizeof_uintptr_t = sizeof(uintptr_t);
+	printf("Size of off_t is: %d\n", sizeof_off_t);
+	printf("Size of uint64_t is: %d\n", sizeof_uint64_t);
+	printf("Size of uintptr_t is: %d\n", sizeof_uintptr_t);
+}