+ ,@(if (%current-target-system)
+ `((("^CROSS_COMPILE=.*$")
+ (string-append "CROSS_COMPILE="
+ ,(%current-target-system) "-"
+ "\n"))
+ (("^HOST=.*$")
+ (string-append "HOST="
+ ,(gnu-triplet->nix-system
+ (%current-target-system)) "\n"))
+ ;; Disable 'install' strip option, that would fail when
+ ;; we are cross-compiling.
+ (("^STRIP=.*$")
+ "STRIP=\n"))
+ '())