(modify-phases %standard-phases
(add-before 'unpack 'fix-cpath
(lambda _
- ;; C_INCLUDE_PATH poses issues for cross-building, leading to
- ;; failures when building avr-libc on 64-bit systems. Simply
- ;; unsetting it allows the build to succeed because it doesn't
- ;; try to use any of the native system's headers.
+ ;; C_INCLUDE_PATH and CPATH pose issues for cross-building,
+ ;; leading to failures when building avr-libc on 64-bit systems.
+ ;; Simply unsetting them allows the build to succeed because it
+ ;; doesn't try to use any of the native system's headers.
(unsetenv "C_INCLUDE_PATH")
+ (unsetenv "CPATH")
#t)))))
(native-inputs `(("avr-binutils" ,avr-binutils)
("avr-gcc" ,avr-gcc)))