PS, I ended up patching it like this:
diff --git a/lempar.c b/lempar.c
index d5ebe69..0e7175a 100644
--- a/lempar.c
+++ b/lempar.c
@@ -230,6 +230,10 @@ static FILE *yyTraceFILE = 0;
static char *yyTracePrompt = 0;
#endif /* NDEBUG */
+#ifndef assert
+#define assert(x)
+#endif
+
#ifndef NDEBUG
/*
** Turn parser tracing on by giving a stream to which to write the trace
@@ -882,8 +886,8 @@ void Parse(
yyact = yy_find_shift_action((YYCODETYPE)yymajor,yyact);
if( yyact >= YY_MIN_REDUCE ){
unsigned int yyruleno = yyact - YY_MIN_REDUCE; /* Reduce by this rule */
- assert( yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) );
#ifndef NDEBUG
+ assert( yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) );
if( yyTraceFILE ){
int yysize = yyRuleInfoNRhs[yyruleno];
if( yysize ){
Christian