diff --git a/MasterPassword/C/build b/MasterPassword/C/build
index 99d31e42..852028ee 100755
--- a/MasterPassword/C/build
+++ b/MasterPassword/C/build
@@ -46,7 +46,7 @@ fetchSource() (
         printf '%s' "$(git describe --always)" > "${PWD##*/}-version"
         return
 
-    elif [[ $svn ]] && hash git 2>/dev/null && hash "$(git --exec-path)/git-svn" 2>/dev/null; then
+    elif [[ $svn ]] && hash git 2>/dev/null && [[ -x "$(git --exec-path)/git-svn" ]]; then
         echo
         echo "Fetching: ${PWD##*/}, using git-svn..."
         git svn clone --prefix=origin/ --stdlayout "$svn" .
@@ -206,6 +206,8 @@ cc() {
         llvm-gcc "$@"
     elif hash gcc 2>/dev/null; then
         gcc -std=gnu99 "$@"
+    elif hash clang 2>/dev/null; then
+        clang "$@"
     else
         echo >&2 "Need a compiler.  Please install GCC or LLVM."
         exit 1
diff --git a/MasterPassword/C/mpw.c b/MasterPassword/C/mpw.c
index 389b4179..3e438c5f 100644
--- a/MasterPassword/C/mpw.c
+++ b/MasterPassword/C/mpw.c
@@ -198,7 +198,7 @@ int main(int argc, char *const argv[]) {
     trc("key scope: %s\n", mpKeyScope);
     const uint32_t n_userNameLength = htonl(strlen(userName));
     const size_t masterKeySaltLength = strlen(mpKeyScope) + sizeof(n_userNameLength) + strlen(userName);
-    char *masterKeySalt = malloc( masterKeySaltLength );
+    char *masterKeySalt = (char *)malloc( masterKeySaltLength );
     if (!masterKeySalt) {
         fprintf(stderr, "Could not allocate master key salt: %d\n", errno);
         return 1;
@@ -213,7 +213,7 @@ int main(int argc, char *const argv[]) {
     trc("masterKeySalt ID: %s\n", IDForBuf(masterKeySalt, masterKeySaltLength));
 
     // Calculate the master key.
-    uint8_t *masterKey = malloc( MP_dkLen );
+    uint8_t *masterKey = (uint8_t *)malloc( MP_dkLen );
     if (!masterKey) {
         fprintf(stderr, "Could not allocate master key: %d\n", errno);
         return 1;
@@ -234,7 +234,7 @@ int main(int argc, char *const argv[]) {
     const uint32_t n_siteNameLength = htonl(strlen(siteName));
     const uint32_t n_siteCounter = htonl(siteCounter);
     const size_t sitePasswordInfoLength = strlen(mpSiteScope) + sizeof(n_siteNameLength) + strlen(siteName) + sizeof(n_siteCounter);
-    char *sitePasswordInfo = malloc( sitePasswordInfoLength );
+    char *sitePasswordInfo = (char *)malloc( sitePasswordInfoLength );
     if (!sitePasswordInfo) {
         fprintf(stderr, "Could not allocate site seed: %d\n", errno);
         return 1;
@@ -265,7 +265,7 @@ int main(int argc, char *const argv[]) {
         abort();
 
     // Encode the password from the seed using the cipher.
-    char *sitePassword = calloc(strlen(cipher) + 1, sizeof(char));
+    char *sitePassword = (char *)calloc(strlen(cipher) + 1, sizeof(char));
     for (int c = 0; c < strlen(cipher); ++c) {
         sitePassword[c] = CharacterFromClass(cipher[c], sitePasswordSeed[c + 1]);
         trc("class %c, character: %c\n", cipher[c], sitePassword[c]);
diff --git a/MasterPassword/C/types.c b/MasterPassword/C/types.c
index fc387441..742605e8 100644
--- a/MasterPassword/C/types.c
+++ b/MasterPassword/C/types.c
@@ -50,19 +50,19 @@ const char *CipherForType(MPElementType type, uint8_t seedByte) {
 
     switch (type) {
         case MPElementTypeGeneratedMaximum: {
-            char *ciphers[] = { "anoxxxxxxxxxxxxxxxxx", "axxxxxxxxxxxxxxxxxno" };
+            const char *ciphers[] = { "anoxxxxxxxxxxxxxxxxx", "axxxxxxxxxxxxxxxxxno" };
             return ciphers[seedByte % 2];
         }
         case MPElementTypeGeneratedLong: {
-            char *ciphers[] = { "CvcvnoCvcvCvcv", "CvcvCvcvnoCvcv", "CvcvCvcvCvcvno", "CvccnoCvcvCvcv", "CvccCvcvnoCvcv", "CvccCvcvCvcvno", "CvcvnoCvccCvcv", "CvcvCvccnoCvcv", "CvcvCvccCvcvno", "CvcvnoCvcvCvcc", "CvcvCvcvnoCvcc", "CvcvCvcvCvccno", "CvccnoCvccCvcv", "CvccCvccnoCvcv", "CvccCvccCvcvno", "CvcvnoCvccCvcc", "CvcvCvccnoCvcc", "CvcvCvccCvccno", "CvccnoCvcvCvcc", "CvccCvcvnoCvcc", "CvccCvcvCvccno" };
+            const char *ciphers[] = { "CvcvnoCvcvCvcv", "CvcvCvcvnoCvcv", "CvcvCvcvCvcvno", "CvccnoCvcvCvcv", "CvccCvcvnoCvcv", "CvccCvcvCvcvno", "CvcvnoCvccCvcv", "CvcvCvccnoCvcv", "CvcvCvccCvcvno", "CvcvnoCvcvCvcc", "CvcvCvcvnoCvcc", "CvcvCvcvCvccno", "CvccnoCvccCvcv", "CvccCvccnoCvcv", "CvccCvccCvcvno", "CvcvnoCvccCvcc", "CvcvCvccnoCvcc", "CvcvCvccCvccno", "CvccnoCvcvCvcc", "CvccCvcvnoCvcc", "CvccCvcvCvccno" };
             return ciphers[seedByte % 21];
         }
         case MPElementTypeGeneratedMedium: {
-            char *ciphers[] = { "CvcnoCvc", "CvcCvcno" };
+            const char *ciphers[] = { "CvcnoCvc", "CvcCvcno" };
             return ciphers[seedByte % 2];
         }
         case MPElementTypeGeneratedBasic: {
-            char *ciphers[] = { "aaanaaan", "aannaaan", "aaannaaa" };
+            const char *ciphers[] = { "aaanaaan", "aannaaan", "aaannaaa" };
             return ciphers[seedByte % 3];
         }
         case MPElementTypeGeneratedShort: {
@@ -75,7 +75,7 @@ const char *CipherForType(MPElementType type, uint8_t seedByte) {
             return "cvccvcvcv";
         }
         case MPElementTypeGeneratedPhrase: {
-            char *ciphers[] = { "cvcc cvc cvccvcv cvc", "cvc cvccvcvcv cvcv", "cv cvccv cvc cvcvccv" };
+            const char *ciphers[] = { "cvcc cvc cvccvcv cvc", "cvc cvccvcvcv cvcv", "cv cvccv cvc cvcvccv" };
             return ciphers[seedByte % 3];
         }
         default: {
@@ -170,7 +170,7 @@ const char *IDForBuf(const void *buf, size_t length) {
     uint8_t hash[32];
     SHA256_Buf(buf, length, hash);
 
-    char *id = calloc(65, sizeof(char));
+    char *id = (char *)calloc(65, sizeof(char));
     for (int kH = 0; kH < 32; kH++)
         sprintf(&(id[kH * 2]), "%02X", hash[kH]);
 
@@ -178,7 +178,7 @@ const char *IDForBuf(const void *buf, size_t length) {
 }
 
 const char *Hex(const void *buf, size_t length) {
-    char *id = calloc(length*2+1, sizeof(char));
+    char *id = (char *)calloc(length*2+1, sizeof(char));
     for (int kH = 0; kH < length; kH++)
         sprintf(&(id[kH * 2]), "%02X", ((const uint8_t*)buf)[kH]);
     return id;