[R] Changing CRAN package compile option defaults?

[Allan Engelhardt]

Is there an easy way to override the compile options when installing 
packages from CRAN on Unix-style systems?  I tried setting CFLAGS, 
CXXFLAGS, and FFLAGS but they are not picked up.

For example (with a random package and adding -mtune only to try to get 
rid of the default)

export CFLAGS="-march=native -mtune=native"
export CXXFLAGS="-march=native -mtune=native"
R CMD INSTALL gstat_0.9-60.tar.gz
[...]
gcc -m64 -std=gnu99 -I/usr/include/R  -I/usr/local/include    -fpic  -O2 
-g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector 
--param=ssp-buffer-size=4 -m64 -mtune=generic -c block.c -o block.o
[...]

I am building a custom system and I'd like to get rid of '-g' (won't 
debug on that system) and change '-mtune=generic' to '-march=native' 
(don't need compatibility with other systems).

Is there an easy way of doing this for all packages I build?

Allan

(Currently re-compiling BLAS and friends with -march=native.)