If one is trying to compile openboot on Solaris using the Solaris C compiler the source code Makefiles' DFLAG settings will need to have "-Xs" added. The code uses the word "restrict" in a prototype which is an ANSI C99 keyword. ------------------ More details ------------------ I was checking the options and trying to understand why an error was occuring on a valid prototype line and tried adding -Xt and eventually -Xs to the compiler options. It looks like it may be a C89/C90 versus C99 issue. The compiler default appears to be ANSI C99 mode based upon this from the -flags output -Xa Compile assuming ANSI C conformance, allow K & R extensions (default mode) -Xc Compile assuming strict ANSI C conformance -Xs Compile assuming (pre-ANSI) K & R C style code -Xt Compile assuming K & R conformance, allow ANSI C and in ./trunk/tools/fscope/fscope.h at line 120 this search_t *build_searchlist(extract_t *info, search_t *root, int restrict); appeared to be causing the error. When I added -Xs this warning was generated "./fscope.h", line 120: warning: restrict is a keyword in ISO C99 instead of this error "./fscope.h", line 120: Non-pointer types cannot be restrict qualified The word argument "restrict" in the prototype appears to be culprit. I appear to have gotten a clean build Sun C 5.3.