Package nltm build failure report

Build errors
models.C: In function `double gammaPH_pred(double, double)': models.C:77: error: `isnan' undeclared (first use this function) models.C:77: error: (Each undeclared identifier is reported only once for each function it appears in.) make[1]: *** [models.o] Error 1 ERROR: compilation failed for package 'nltm'
Build output
* checking for file 'nltm/DESCRIPTION' ... OK * preparing 'nltm': * checking DESCRIPTION meta-information ... OK * cleaning src * removing junk files * checking for LF line-endings in source files * checking for empty directories * building binary distribution * Installing *source* package 'nltm' ... ** libs g++-3.3 -no-cpp-precomp -I/Library/Frameworks/R.framework/Resources/include -I/usr/local/include -fno-common -g -O2 -c covariance.C -o covariance.o g++-3.3 -no-cpp-precomp -I/Library/Frameworks/R.framework/Resources/include -I/usr/local/include -fno-common -g -O2 -c dmat.C -o dmat.o g++-3.3 -no-cpp-precomp -I/Library/Frameworks/R.framework/Resources/include -I/usr/local/include -fno-common -g -O2 -c models.C -o models.o ** Removing '/private/tmp/Rinst.5163/nltm' ERROR * installation failed