Make identicon color an optional feature and specify the dependency.

MasterPassword/C/build

@@ -9,6 +9,8 @@
 #       try ./build -lrt instead.
 #   - If you see 'x86.S:202: Error: junk at end of line, first unrecognized character is `,'',
 #       try commenting the line in lib/bcrypt/x86.S.
+#   - Take a look at the "Optional features" section.  Some features have dependencies,
+#       either make sure you have them or disable those features.
 #
 # BUGS
 #   masterpassword@lyndir.com
@@ -35,6 +37,9 @@ else
     )
 fi
 
+# Optional features.
+mpw_color=1 # Colorized Identicon, requires libncurses-dev
+
 
 ### DEPENDENCIES
 
@@ -192,7 +197,7 @@ mpw() {
         # library paths
         -L"." -L"lib/scrypt"
         # link libraries
-        -l"crypto" -l"curses"
+        -l"crypto"
         # scrypt
         "lib/scrypt/scrypt-crypto_aesctr.o"
         "lib/scrypt/scrypt-sha256.o"
@@ -201,6 +206,8 @@ mpw() {
         "lib/scrypt/scrypt-scryptenc_cpuperf.o"
         "lib/scrypt/scrypt-scryptenc.o"
     )
+    # optional features
+    (( mpw_color )) && CFLAGS+=( -DCOLOR ) LDFLAGS+=( -l"curses" )
 
     cc "${CFLAGS[@]}"                 -c types.c -o types.o "$@"
     cc "${CFLAGS[@]}" "${LDFLAGS[@]}" "types.o" mpw.c -o mpw "$@"

MasterPassword/C/types.c

@@ -217,7 +217,7 @@ const char *Identicon(const char *userName, const char *masterPassword) {
     uint8_t identiconSeed[32];
     HMAC_SHA256_Buf(masterPassword, strlen(masterPassword), userName, strlen(userName), identiconSeed);
 
-    char *identicon = (char *)calloc(20, sizeof(char));
+#ifdef COLOR
     setupterm(NULL, 2, NULL);
     initputvar();
     tputs(tparm(tgetstr("AF", NULL), identiconSeed[4] % 7 + 1), 1, putvar);
@@ -226,6 +226,11 @@ const char *Identicon(const char *userName, const char *masterPassword) {
     tputs(tgetstr("me", NULL), 1, putvar);
     char reset[strlen(putvarc)];
     strcpy(reset, putvarc);
+#else
+    const char *red = "", *reset = "";
+#endif
+
+    char *identicon = (char *)calloc(20, sizeof(char));
     sprintf(identicon, "%s%s%s%s%s%s",
             red,
             left[identiconSeed[0] % (sizeof(left) / sizeof(left[0]))],