To build, just `make' it. You will need GNU make; it won't work well with
any other kind of make(1). Once built, the executable is called raytrace.
+Caveats:
+
+1. The PPM importer doesn't handle comments, and the BMP importer is also
+quite picky about the depth and color space.
+
Known to run on:
- * Linux 3.2.1-gentoo (x86_64)
+ * Linux 3.2.12-gentoo (x86_64)
+ * Darwin 10.8.0 (in the Mac lab)
+
+Known to NOT run on:
+ * NetBSD 5.1.2 (amd64)
+ * Win32 (tried with i686-mingw32-g++)