Hi, I followed this message, https://stat.ethz.ch/pipermail/r-devel/2004-February/028942.html, to compile ATLAS with gcc and g77 on AMD Opteron. I then followed the instructions on this message, https://stat.ethz.ch/pipermail/r-devel/2004-February/028966.html, to convert static libraries to dynamic libraries. However, when I tried to configure R-devel, I got the following error messages in config.log: configure:33172: checking for sgemm_ in -lf77blas configure:33210: /usr/pgi/linux86-64/6.0/bin/pgcc -o conftest -g -O2 -mieee-fp -I/usr/pgi/linux86-64/6.0/include -I/usr/pgi/l\ inux86-64/6.0/include/CC -L/usr/pgi/linux86-64/6.0/libso -L/usr/lib64 -L/usr/local/lib64 conftest.c -lf77blas -latlas -lpgftn\ rtl -lnspgc -lpgc -lm -ldl -lm >&5 pgcc-Warning-Unknown switch: -mieee-fp NOTE: your evaluation license will expire in 14 days, 0.426 hours. For a permanent license, please read the order acknowledgement that you received. Connect to https://www.pgroup.com/License with the username and password in the order acknowledgement. Name: lai User: lai Email: lai at lindaspaces.com Hostid: PGI=00001AE0190CAB621CB217 /usr/local/lib64/libf77blas.so: undefined reference to `e_wsfe' /usr/local/lib64/libf77blas.so: undefined reference to `do_fio' /usr/local/lib64/libf77blas.so: undefined reference to `s_stop' /usr/local/lib64/libf77blas.so: undefined reference to `s_wsfe' My LD_LIBRARY_PATH=/usr/pgi/linux86-64/libso:/usr/local/lib64 Can anyone advise me on how to build R with ATLAS? Thanks, Jennifer