Library not loaded: /usr/local/lib/libquadmath.0.dylib

Dear Simon, 

Thanks for the quick reply. I tried to do what you suggested:

install_name_tool -id /Library/Frameworks/R.framework/Versions/3.1/Resources/lib/libquadmath.0.dylib /usr/local/lib/libquadmath.0.dylib

But I got the following error messages:

error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/install_name_tool: can't open input file: /usr/local/lib/libquadmath.0.dylib for writing (Permission denied)
error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/install_name_tool: can't lseek to offset: 0 in file: /usr/local/lib/libquadmath.0.dylib for writing (Bad file descriptor)
error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/install_name_tool: can't write new headers in file: /usr/local/lib/libquadmath.0.dylib (Bad file descriptor)
error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/install_name_tool: can't close written on input file: /usr/local/lib/libquadmath.0.dylib (Bad file descriptor)

The first error (Permission denied) can be solved by using "sudo" I suppose. But I am not sure what caused the other three errors. Do you happen know what may have been the root of the errors? Thank you again.

sudo should solve them all - the FD is invalid because it could not be opened in the first place.

Note that if you can't sudo, you can also use install_name_tool -change on the package .so to change the path there instead. But the above would be a more permanent solution.

Cheers,
Simon
Best,
-Xiao

On Wed, Sep 3, 2014 at 3:20 PM, Simon Urbanek <simon.urbanek at r-project.org> wrote:
On Sep 3, 2014, at 4:18 AM, Xiao He <praguewatermelon at gmail.com> wrote:

Hi all,

I tried to load a package which includes a shared object on one of my Macs,
and I got an error message below, which suggests that the file "
libquadmath.0.dylib" is missing in the /usr/local/lib folder. On my other
Mac however, I have no problem loading the package, and the file "
libquadmath.0.dylib" is in the /usr/local/lib folder. I wonder where this
libquadmath.0.dylib file is from, and how I can install it on the computer
where it is missing. Thanks!

libquadmath is part of the Fortran compiler, it is not a standard library, so it will be only present if you install the compiler.

Note that the Mavericks build of R on CRAN also ships with the quadmath library and Mavericks CRAN package binaries use it from there. If you compile a package yourself and want others to be able to use it, you may want to change the path from /usr/local/lib/libquadmath.0.dylib to /Library/Frameworks/R.framework/Versions/3.1/Resources/lib/libquadmath.0.dylib via install_name_tool --- the same goes for libgfortran.3.dylib.

Cheers,
Simon

library(WRScpp)
Error in dyn.load(file, DLLpath = DLLpath, ...) :
 unable to load shared object
'/Library/Frameworks/R.framework/Versions/3.1/Resources/library/WRScpp/libs/WRScpp.so':

dlopen(/Library/Frameworks/R.framework/Versions/3.1/Resources/library/WRScpp/libs/WRScpp.so,
6): Library not loaded: /usr/local/lib/libquadmath.0.dylib
 Referenced from:
/Library/Frameworks/R.framework/Versions/3.1/Resources/library/WRScpp/libs/WRScpp.so
 Reason: image not found
Error: package or namespace load failed for ?WRScpp??

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Library not loaded: /usr/local/lib/libquadmath.0.dylib

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