diff --git a/programs/hash/generic_sum.c b/programs/hash/generic_sum.c
index 2b0e7cc..04e1c04 100644
--- a/programs/hash/generic_sum.c
+++ b/programs/hash/generic_sum.c
@@ -30,8 +30,17 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "polarssl/config.h"
+
 #include "polarssl/md.h"
 
+#if !defined(POLARSSL_MD_C)
+int main( void )
+{
+    printf("POLARSSL_MD_C not defined.\n");
+    return( 0 );
+}
+#else
 static int generic_wrapper( const md_info_t *md_info, char *filename, unsigned char *sum )
 {
     int ret = md_file( md_info, filename, sum );
@@ -201,3 +210,4 @@
 
     return( ret );
 }
+#endif /* POLARSSL_MD_C */
diff --git a/programs/hash/hello.c b/programs/hash/hello.c
index f9dc3f3..d40c695 100644
--- a/programs/hash/hello.c
+++ b/programs/hash/hello.c
@@ -29,8 +29,17 @@
 
 #include <stdio.h>
 
+#include "polarssl/config.h"
+
 #include "polarssl/md5.h"
 
+#if !defined(POLARSSL_MD5_C)
+int main( void )
+{
+    printf("POLARSSL_MD5_C not defined.\n");
+    return( 0 );
+}
+#else
 int main( void )
 {
     int i;
@@ -53,3 +62,4 @@
 
     return( 0 );
 }
+#endif /* POLARSSL_MD5_C */
diff --git a/programs/hash/md5sum.c b/programs/hash/md5sum.c
index 2d72d99..fb7283c 100644
--- a/programs/hash/md5sum.c
+++ b/programs/hash/md5sum.c
@@ -30,8 +30,17 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "polarssl/config.h"
+
 #include "polarssl/md5.h"
 
+#if !defined(POLARSSL_MD5_C) || !defined(POLARSSL_FS_IO)
+int main( void )
+{
+    printf("POLARSSL_MD5_C and/or POLARSSL_FS_IO not defined.\n");
+    return( 0 );
+}
+#else
 static int md5_wrapper( char *filename, unsigned char *sum )
 {
     int ret = md5_file( filename, sum );
@@ -159,3 +168,4 @@
 
     return( ret );
 }
+#endif /* POLARSSL_MD5_C && POLARSSL_FS_IO */
diff --git a/programs/hash/sha1sum.c b/programs/hash/sha1sum.c
index 03b7766..155bfbf 100644
--- a/programs/hash/sha1sum.c
+++ b/programs/hash/sha1sum.c
@@ -30,8 +30,17 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "polarssl/config.h"
+
 #include "polarssl/sha1.h"
 
+#if !defined(POLARSSL_SHA1_C) || !defined(POLARSSL_FS_IO)
+int main( void )
+{
+    printf("POLARSSL_SHA1_C and/or POLARSSL_FS_IO not defined.\n");
+    return( 0 );
+}
+#else
 static int sha1_wrapper( char *filename, unsigned char *sum )
 {
     int ret = sha1_file( filename, sum );
@@ -159,3 +168,4 @@
 
     return( ret );
 }
+#endif /* POLARSSL_SHA1_C && POLARSSL_FS_IO */
diff --git a/programs/hash/sha2sum.c b/programs/hash/sha2sum.c
index b369295..52939e4 100644
--- a/programs/hash/sha2sum.c
+++ b/programs/hash/sha2sum.c
@@ -30,8 +30,17 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "polarssl/config.h"
+
 #include "polarssl/sha2.h"
 
+#if !defined(POLARSSL_SHA2_C) || !defined(POLARSSL_FS_IO)
+int main( void )
+{
+    printf("POLARSSL_SHA2_C and/or POLARSSL_FS_IO not defined.\n");
+    return( 0 );
+}
+#else
 static int sha2_wrapper( char *filename, unsigned char *sum )
 {
     int ret = sha2_file( filename, sum, 0 );
@@ -159,3 +168,4 @@
 
     return( ret );
 }
+#endif /* POLARSSL_SHA2_C && POLARSSL_FS_IO */