(Warning: I'm not an R guy. I'm a Python guy trying to get the R-Python interface working again after some upgrades.) I'm trying to upgrade our numpy/rpy/matplotlib environment (Solaris 10/Intel, Python 2.4). In the process I found I needed to rebuild R (2.1.1) because it was compiled with gcc 3.3.2 and we have since migrated to gcc 3.4.1. I'm using this configure setup: export CPPFLAGS=-I/opt/app/include export LDFLAGS='-L/opt/app/lib -R/opt/app/lib' ./configure --prefix=/opt/app/R-2.1.1-gcc-3.4.1 After building and installing R I downloaded and installed the contributed quadprog library. I ran this simple solver example using Python+rpy which works (well, except for some R error I haven't figured out yet) in the old installation: import numpy import rpy rpy.r("library(quadprog)") Dmat = numpy.identity(3, numpy.float_) print Dmat rpy.r.assign("Dmat", Dmat) dvec = numpy.array([0,5,0], numpy.float_) print dvec rpy.r.assign("dvec", dvec) Amat = numpy.array([[-4,-3,0], [2,1,0], [0,-2,1]], numpy.float_) print Amat rpy.r.assign("Amat", Amat.transpose()) bvec = numpy.array([-8,2,0], numpy.float_) print bvec rpy.r.assign("bvec", bvec) result = rpy.r("solve.QP(Dmat, dvec, Amat, bvec=bvec)") print result['solution'] and get this error: Error in dyn.load(x, as.logical(local), as.logical(now)) : unable to load shared library '/opt/app/R-2.1.1-gcc-3.4.1/lib/R/library/grDevices/libs/grDevices.so': ld.so.1: python: fatal: relocation error: file /opt/app/R-2.1.1-gcc-3.4.1/lib/R/library/grDevices/libs/grDevices.so: symbol R_NilValue: referenced symbol not found Loading required package: grDevices Error in dyn.load(x, as.logical(local), as.logical(now)) : unable to load shared library '/opt/app/R-2.1.1-gcc-3.4.1/lib/R/library/grDevices/libs/grDevices.so': ld.so.1: python: fatal: relocation error: file /opt/app/R-2.1.1-gcc-3.4.1/lib/R/library/grDevices/libs/grDevices.so: symbol R_NilValue: referenced symbol not found In addition: Warning message: package grDevices in options("defaultPackages") was not found Error: package 'grDevices' could not be loaded Traceback (most recent call last): File "rpytest.py", line 3, in ? rpy.r("library(quadprog)") File "/opt/app/g++lib6/python-2.4-pre-release/lib/python2.4/site-packages/rpy.py", line 299, in __call__ return self.eval(self.parse(text=s)) rpy.RException: Error: package/namespace load failed for 'quadprog' Looking at grDevices.so I see that it wasn't even linked against the R library: % ldd /opt/app/R-2.1.1-gcc-3.4.1/lib/R/library/grDevices/libs/grDevices.so libc.so.1 => /lib/libc.so.1 libm.so.2 => /lib/libm.so.2 so I can't see how it could possibly resolve the R_NilValue symbol. Can someone tell me where I've gone awry? Thanks, Skip Montanaro skip at pobox.com