Installation output for sdl2 [fail]

Installation time: 0s

'/usr/home/chicken/salmonella/build/salmonella-run-publish/chicken/bin/chicken-install' -v 2>&1
checking sdl2 ...
checking platform for `sdl2'
checking dependencies for `sdl2'
install order:
("sdl2")
building sdl2
running script /usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2/sdl2.build.sh
executing: "sh /usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2/sdl2.build.sh"
   /usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2/custom-build.sh -host -D compiling-extension -J -s -regenerate-import-libraries -setup-mode -I /usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2 -C -I/usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2 -O2 -d1 sdl2-features.scm -o /usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2/sdl2-features.so
/usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2/sdl2-features.c:10:10: fatal error: 'SDL.h' file not found
#include "SDL.h"
         ^~~~~~~
1 error generated.

Error: shell command terminated with non-zero exit status 256: 'clang' '/usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2/sdl2-features.c' -o '/usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2/sdl2-features.o' -c  -fno-strict-aliasing -fwrapv -DHAVE_CHICKEN_CONFIG_H -DC_ENABLE_PTABLES -Os -fomit-frame-pointer -fPIC -DPIC -DC_SHARED -I/usr/local/include/db6 -I/usr/local/include -I/usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2 -I/usr/home/chicken/salmonella/build/salmonella-run-publish/chicken/include/chicken -I'/usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/include/chicken'

Error: shell command terminated with nonzero exit code
256
"sh /usr/home/chicken/salmonella/build/salmonella-run-publish/salmonella-repo/repo/cache/sdl2/sdl2.build.sh"