I built pov 3.7 rc6 on my Raspberry PI. There are a couple of issues.

Here's the blurb from configure (source was povray-3.7.0.RC6.tar.gz):

   POV-Ray 3.7.0.RC5 has been configured.

   Built-in features:
     I/O restrictions:          enabled
     X Window display:          enabled (using SDL)
     Supported image formats:   gif tga iff ppm pgm hdr png jpeg tiff
     Unsupported image formats: openexr

   Compilation settings:
     Build architecture:  armv6l-unknown-linux-gnueabi
     Built/Optimized for: armv6l-unknown-linux-gnueabi
     Compiler vendor:     gnu
     Compiler version:    g++ 4.6
     Compiler flags:      -pipe -Wno-multichar -Wno-write-strings 
-fno-enforce-eh-specs -s -O3 -ffast-math -pthread

I got the following compiler errors:

   shape/poly.cpp:188:3: warning: this decimal constant is unsigned only 
in ISO C90 [enabled by default]
   shape/poly.cpp:188:3: warning: this decimal constant is unsigned only 
in ISO C90 [enabled by default]
   shape/poly.cpp:188:3: warning: this decimal constant is unsigned only 
in ISO C90 [enabled by default]

   processoptions.cpp:1180:9: warning: case label value is less than 
minimum value for type [enabled by default]

   povms.cpp:304:3: warning: anonymous type with no linkage used to 
declare variable '<anonymous struct> POVMSStreamOrderTables' with 
linkage [enabled by default]

   renderfrontend.cpp:1165:57: warning: trigraph ??) ignored, use 
-trigraphs to enable [-Wtrigraphs]

   vfesession.cpp:594:11: warning: case label value is less than minimum 
value for type [enabled by default]

Of the above, the errors in processoptions.cpp & vfesession.cpp are 
significant. On this platform a 'char' is unsigned by default. Here's a 
test program that exhibits the same error message and shows that there 
are actual errors:

   #include <stdio.h>

   enum badT  { bAA, bBB        } bad_e;
   enum goodT { gAA, gBB, xx=-1 } good_e;

   main( int ac, char ** av )
   {
     char ch = EOF;
     signed char sch = EOF;

     printf( "ch=%d, sch=%d\n", ch, sch );

     bad_e = (badT) -1;
     good_e = (goodT) -1;
     printf( "bad_e=%d, good_e=%d\n", bad_e, good_e );

     switch( bad_e ) {
       case bAA: printf( "case bad_e == bAA\n" ); break;
       case -1:  printf( "case bad_e == -1\n" ); break;
       default:  printf( "case bad_e == ? (default)\n" ); break;
     }

     switch( good_e ) {
       case gAA: printf( "case good_e == gAA\n" ); break;
       case -1:  printf( "case good_e == -1\n" ); break;
       default:  printf( "case good_e == ? (default)\n" ); break;
     }
   }

   $ g++ t.cpp
   t.cpp: In function 'int main(int, char**)':
   t.cpp:19:11: warning: case label value is less than minimum value for 
type [enabled by default]

   $ ./a.out
   ch=255, sch=-1
   bad_e=-1, good_e=-1
   case bad_e == ? (default)
   case good_e == -1

Thus you can see that neither the 'case EOF:' at line 1180 of 
processoptions.cpp nor the 'case -1:' at line 594 of vfesession.cpp will 
match unless the patches below are applied.

Here are a couple of patches that fix those two significant errors. For 
simplefrontend.h someone who understands why the enum variable gets 
assigned a '-1' will have to rework the patch and fix the actual 
assignment rather the kludging the declaration.

--- ./source/base/processoptions.cpp.orig       2012-02-05 
14:54:15.000000000 -0600
+++ ./source/base/processoptions.cpp    2012-08-16 11:17:19.773490094 -0500
@@ -1167,7 +1167,7 @@
         str[0] = 0;
         for (int i = 0; i < 65536; i++, *pos = 0)
         {
-               char ch = file->getchar();
+               int ch = file->getchar();
                 if (hadEscape && (ch == '"' || ch == '\'' || ch == '\\'))
                 {
                         hadEscape = false;


--- ./source/frontend/simplefrontend.h.orig     2012-02-05 
14:54:18.000000000 -0600
+++ ./source/frontend/simplefrontend.h  2012-08-16 11:22:46.244738423 -0500
@@ -124,7 +124,8 @@
         kStopping,
         kStopped,
         kFailed,
-       kDone
+       kDone,
+       kminusone = -1
  };

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