Set R_HOME

Author: eddelbuettel

configure

@@ -1,5 +1,7 @@
 #!/usr/bin/env sh
 
+# Set R_HOME based on where R is
+: ${R_HOME=$(R RHOME)}
 # Find R compilers
 CC=`${R_HOME}/bin/R CMD config CC`
 CFLAGS=`${R_HOME}/bin/R CMD config CFLAGS`