I am attempting to update the sile package to 0.15.0 but due to some issues I
temporarily need to use luajit.

The problem is that SILE expects certain header files which are not in
luajit-devel:
[    5s] checking for icu-uc icu-io... yes
[    5s] checking for a Lua interpreter with version >= 5.1... luajit
[    5s] checking for luajit... /usr/bin/luajit
[    5s] checking for luajit version... 5.1
[    5s] checking for luajit jit version... 2.1.1707061634
[    5s] checking for luajit platform... unknown
[    5s] checking for luajit script directory... ${prefix}/share/luajit-5_1-2.1
[    5s] checking for luajit module directory... ${exec_prefix}/lib64/lua/5.1
[    5s] checking if LUA_VERSION is defined... yes
[    5s] checking if LUAJIT_VERSION is defined... yes
[    5s] checking for lua.h... no
[    6s] checking for lualib.h... no
[    6s] checking for lauxlib.h... no
[    6s] checking for luaconf.h... no
[    6s] checking for luajit.h... no
[    6s] configure: error: cannot find Lua includes

SILE does correctly identify the headers for lua5.4 though:
[   23s] checking if LUA_VERSION is defined... yes
[   23s] checking for lua.h... no
[   24s] checking for lualib.h... no
[   24s] checking for lauxlib.h... no
[   24s] checking for luaconf.h... no
[   24s] checking for Lua headers in... /usr/include/lua5.4
[   24s] checking for lua.h... yes
[   24s] checking for lualib.h... yes
[   24s] checking for lauxlib.h... yes
[   24s] checking for luaconf.h... yes
[   24s] checking for Lua header version... 5.4
...

I think luajit-devel should include the requested headers