% more x.c
main(int l){char q[l+1];int i=0; for (i=0;i < l+1;i++)q[i]=i; }
% gcc -c x.c
compiles without incident.
% pgcc -c x.c -c9x
PGC-S-0091-Integer constant expression required (x.c: 1)
PGC/x86-64 Linux/x86-64 5.2-1: compilation completed with severe errors
user would like the code to compile.