Hi all, Yes, I know 5.3 is old, but it's a system I have to work with at present. I have the latest supported xlC + friends. gcc building is not an option on this system for other reasons. I have read the install instructions and set the env vars according to those and also am using the freeware iconv and other GNU tools where needed. Problem - the Matrix package hangs on installing. Gets to: Loading required package: Matrix and then nothing. Left overnight even. My env vars look like this: export OBJECT_MODE=64 export LIBICONV=/opt/freeware export CC="xlc_r -q64" export CFLAGS="-O -qstrict" export CXX="xlC_r -q64" export CXXFLAGS="-O -qstrict" export F77="xlf_r -q64" export AR="ar -X64" export CPPFLAGS="-I$LIBICONV/include -I/usr/lpp/X11/include/X11" export LDFLAGS="-L$LIBICONV/lib -L/usr/lib -L/usr/X11R6/lib" xlc -qversion IBM XL C/C++ for AIX, V12.1 (5765-J02, 5725-C72) Version: 12.01.0000.0011 xlC -qversion IBM XL C/C++ for AIX, V12.1 (5765-J02, 5725-C72) Version: 12.01.0000.0011 xlf -qversion IBM XL Fortran for AIX, V12.1 Version: 12.01.0000.0000 I have tried with R_SHELL set to bash and ksh. My login shell is bash. I have tried with enable static and disable shared. I have subsequently built without recommended packages. R build and installs. (Minor issue with the location of libRblas but I solved that. I have then tried doing a install.packages("Matrix") from R. Same thing. Hangs. Any ideas? I can supply more information as needed. Please let me know what you would like to know. Kind regards Derek Jones Senior Software Engineer, CTG at IBM. -- View this message in context: http://r.789695.n4.nabble.com/Matrix-loading-hangs-on-AIX-5-3-with-3-1-2-tp4708136.html Sent from the R devel mailing list archive at Nabble.com.