Attempt to fix the Lua version situation

Drawing heavily on #589 by @dlbeer, attempt to fix the utter
nonsense pkg-config and all various distributors brought on the
world by

- Normalising 'lua-X.Y' and 'luaXY' notations to mean the same thing
- Handle both notations existing on the system correctly
- Picking the numerically highest version

There is also an option to override this autodetection mechanism by
setting the `LUA_PKGNAME` environment variable prior to kicking a
build off, resulting in the specified Lua package to be used.

Tested to be working on FreeBSD 13.1, Ubuntu 22.04 and Debian 11.

1 files changed, 5 insertions, 4 deletions

diff --git a/src/Makefile b/src/Makefile
index defd77a..0915f41 100755
--- a/src/Makefile
+++ b/src/Makefile
@@ -134,12 +134,13 @@ ifneq (, $(shell which pkg-config))
   endif
 
   # NOTE: lua support
-  ifneq ($(shell pkg-config --exists lua || echo 'no'),no) # Check for user's default lua
-    CFLAGS += -DXLUA $(shell pkg-config --cflags lua)
+  LUA_PKGNAME ?= $(shell pkg-config --list-all | awk '/^lua-?[0-9.]+[[:space:]]/ { p=$$1; gsub("[^[0-9]", "", p); print p " " $$1; }' | LC_ALL=C sort -nrk1 | uniq | head -n 1 | awk '{print $$2}')
+  ifneq ($(LUA_PKGNAME),)
+    CFLAGS += -DXLUA $(shell pkg-config --cflags $(LUA_PKGNAME))
     ifneq ($(shell uname -s),Darwin)
-      LDLIBS += $(shell pkg-config --libs lua) -Wl,--export-dynamic
+      LDLIBS += $(shell pkg-config --libs $(LUA_PKGNAME)) -Wl,--export-dynamic
     else
-      LDLIBS += $(shell pkg-config --libs lua) -rdynamic
+      LDLIBS += $(shell pkg-config --libs $(LUA_PKGNAME)) -rdynamic
     endif
   else ifneq ($(shell pkg-config --exists luajit || echo 'no'),no) # If not found, check for luajit
     CFLAGS += -DXLUA $(shell pkg-config --cflags luajit)