[R] make check failed on linux-amd64 using PGI compilers

[Liaw, Andy]

Dear R-help,

I am trying to build R-2.2.0-patched (2005-11-07 r36217) on the head node of
a Scyld cluster (dual Opteron 250s) using PGI compilers (v6.0).  I used the
flags suggested by Jennifer Lai on R-devel (taken from R-admin, except that
I had to add -L/usr/X11R6/lib64 to LDFLAGS).  The build went fine, but make
check-all failed when running tests/Examples/graphics-Ex.R, at:

> plot(1:2, xaxs = "i") # 'inner-axis' w/o extra space
> stopifnot(par("xaxp")[1:2] == 1:2 &&
+           par("usr")[1:2] == 1:2)
Error: par("xaxp")]1:2] == 1:2 && par("usr")[1:2] == 1:2 is not TRUE

The above looks a bit strange to me, as running the R built as above,
par("xaxp")[1:2] - 1:2 gives

[1] -1.110223e-16 -2.220446e-16

Is my R build faulty?  I'd very much appreciate any advise.

Best,
Andy