Installation FAQ

Update May 2020: Source install on Mojave

1. Install gfortran 6.1 binary dmg from https://github.com/fxcoudert/gfortran-for-macOS/releases
2. Add two symlinks to make it visible. Note that if you already have a gcc/gfortran installed (hopefully a more modern version), these symlinks may affect it.

 cd /usr/local/lib
 ln -sv /usr/local/gfortran/lib/libgfortran.3.dylib libgfortran.3.dylib
 ln -sv /usr/local/gfortran/lib/libquadmath.0.dylib libquadmath.0.dylib

After this you should be able to install from source as usual, following the commands below.

Macs users: You might need to specify type="source" in your call to install.packages. Like this:

install.packages(c("smwrData", "smwrBase", "smwrGraphs", "smwrStats", 
"smwrQW", "rloadest"), repos=c("http://owi.usgs.gov/R", 
"http://cran.us.r-project.org"), dependencies=TRUE, type="source")

Macs running OS X: You need gfortran-4.8 to install smwrStats (a dependency of rloadest and therefore loadflex). Other users have discovered that this is not properly installed/linked for them. A solution that has worked is to run these lines from the terminal:

curl -O http://r.research.att.com/libs/gfortran-4.8.2-darwin13.tar.bz2
sudo tar fvxz gfortran-4.8.2-darwin13.tar.bz2 -C /

(The above lines come from http://www.thecoatlessprofessor.com/programming/rcpp-rcpparmadillo-and-os-x-mavericks-lgfortran-and-lquadmath-error/ and http://stackoverflow.com/questions/23916219/os-x-package-installation-depends-on-gfortran-4-8 ) Again, email feedback welcome!