Why don't you try to install it manually? Just download from cran and install from local archive. Maybe that works better. From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of Ben Michel Sent: Wednesday, April 30, 2008 4:21 AM To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] gov2001-l Digest, Vol 40, Issue 20 Hi all, I'm having trouble installing MatchIt, or more specifically, lpSolve... it looks like the Mac binary isn't working (according to CRAN), though I had it working last week before I updated R to 2.7.0... I get the following error when installing from the source: gcc -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -mmacosx-version-min=10.4 -std=gnu99 -I/Library/Frameworks/R.framework/Resources/include -I/Library/Frameworks/R.framework/Resources/include/ppc -I/usr/local/include -I . -DINTEGERTIME -DPARSER_LP -DBUILDING_FOR_R -DYY_NEVER_INTERACTIVE -DUSRDLL -DCLOCKTIME -DRoleIsExternalInvEngine -DINVERSE_ACTIVE=INVERSE_LUSOL -DINLINE=static -DParanoia -fPIC -g -O2 -c lpslink55.c -o lpslink55.o lpslink55.c:11:20: error: malloc.h: No such file or directory make: *** [lpslink55.o] Error 1 chmod: /Library/Frameworks/R.framework/Versions/2.7/Resources/library/lpSolve/libs/ ppc/*: No such file or directory ERROR: compilation failed for package 'lpSolve' Any thoughts? Thanks, Ben