5 files changed, 53 insertions, 11 deletions

diff --git a/Makefile b/Makefile
index 1213a589..2f640ae6 100644
--- a/Makefile
+++ b/Makefile
@@ -80,6 +80,11 @@ src/luarocks/site_config.lua: config.unix
         echo "LUAROCKS_UNAME_M=[[$(LUAROCKS_UNAME_M)]]" >> src/luarocks/site_config.lua
         echo "LUAROCKS_DOWNLOADER=[[$(LUAROCKS_DOWNLOADER)]]" >> src/luarocks/site_config.lua
         echo "LUAROCKS_MD5CHECKER=[[$(LUAROCKS_MD5CHECKER)]]" >> src/luarocks/site_config.lua
+        if [ -n "$(MULTIARCH_SUBDIR)" ] ;\
+        then \
+           echo 'LUAROCKS_EXTERNAL_DEPS_SUBDIRS={ bin="bin", lib={ "lib", [[$(MULTIARCH_SUBDIR)]] }, include="include" }' >> src/luarocks/site_config.lua ;\
+           echo 'LUAROCKS_RUNTIME_EXTERNAL_DEPS_SUBDIRS={ bin="bin", lib={ "lib", [[$(MULTIARCH_SUBDIR)]] }, include="include" }' >> src/luarocks/site_config.lua ;\
+        fi
 
 dev:
         $(MAKE) build_bins LUADIR=$(PWD)/src
diff --git a/configure b/configure
index a5aa1f4d..579e96f5 100755
--- a/configure
+++ b/configure
@@ -14,6 +14,7 @@ LUA_BINDIR="/usr/bin"
 LUA_INCDIR="/usr/include"
 LUA_LIBDIR="/usr/lib"
 LUA_VERSION="5.1"
+MULTIARCH_SUBDIR=""
 
 # ----------------------------------------------------------------------------
 # FUNCTION DEFINITIONS
@@ -396,6 +397,15 @@ else
    echo "Using unversioned rocks dir: $PREFIX$LUAROCKS_ROCKS_SUBDIR"
 fi
 
+if [ "$LUAROCKS_UNAME_S" = Linux ]
+then
+   GCC_ARCH=`gcc -print-multiarch 2>/dev/null`
+   if [ -n "$GCC_ARCH" -a -d "/usr/lib/$GCC_ARCH" ]
+   then
+      MULTIARCH_SUBDIR="lib/$GCC_ARCH"
+   fi
+fi
+
 if [ -f config.unix ]; then
    rm -f config.unix
 fi
@@ -426,6 +436,7 @@ LUAROCKS_UNAME_S=$LUAROCKS_UNAME_S
 LUAROCKS_DOWNLOADER=$LUAROCKS_DOWNLOADER
 LUAROCKS_MD5CHECKER=$LUAROCKS_MD5CHECKER
 LUAROCKS_ROCKS_SUBDIR=$LUAROCKS_ROCKS_SUBDIR
+MULTIARCH_SUBDIR=$MULTIARCH_SUBDIR
 
 EOF
 
diff --git a/src/luarocks/cfg.lua b/src/luarocks/cfg.lua
index 8e26bb46..94afe0a0 100644
--- a/src/luarocks/cfg.lua
+++ b/src/luarocks/cfg.lua
@@ -254,12 +254,12 @@ local defaults = {
       STATFLAG = "-c '%a'",
    },
 
-   external_deps_subdirs = {
+   external_deps_subdirs = site_config.LUAROCKS_EXTERNAL_DEPS_SUBDIRS or {
       bin = "bin",
       lib = "lib",
       include = "include"
    },
-   runtime_external_deps_subdirs = {
+   runtime_external_deps_subdirs = site_config.LUAROCKS_RUNTIME_EXTERNAL_DEPS_SUBDIRS or {
       bin = "bin",
       lib = "lib",
       include = "include"
diff --git a/src/luarocks/deps.lua b/src/luarocks/deps.lua
index f24dc507..7f3b44f2 100644
--- a/src/luarocks/deps.lua
+++ b/src/luarocks/deps.lua
@@ -583,7 +583,19 @@ function check_external_deps(rockspec, mode)
                prefix = prefix.prefix
             end
             for dirname, dirdata in pairs(dirs) do
-               dirdata.dir = vars[name.."_"..dirname] or dir.path(prefix, dirdata.subdir)
+               local paths
+               local path_var_value = vars[name.."_"..dirname]
+               if path_var_value then
+                  paths = { path_var_value }
+               elseif type(dirdata.subdir) == "table" then
+                  paths = {}
+                  for i,v in ipairs(dirdata.subdir) do
+                     paths[i] = dir.path(prefix, v)
+                  end
+               else
+                  paths = { dir.path(prefix, dirdata.subdir) }
+               end
+               dirdata.dir = paths[1]
                local file = files[dirdata.testfile]
                if file then
                   local files = {}
@@ -605,16 +617,22 @@ function check_external_deps(rockspec, mode)
                      if f:match("%.so$") or f:match("%.dylib$") or f:match("%.dll$") then
                         f = f:gsub("%.[^.]+$", "."..cfg.external_lib_extension)
                      end
-                     if f:match("%*") then
-                        local replaced = f:gsub("%.", "%%."):gsub("%*", ".*")
-                        for _, entry in ipairs(fs.list_dir(dirdata.dir)) do
-                           if entry:match(replaced) then
-                              found = true
-                              break
+                     for _, d in ipairs(paths) do
+                        if f:match("%*") then
+                           local replaced = f:gsub("%.", "%%."):gsub("%*", ".*")
+                           for _, entry in ipairs(fs.list_dir(d)) do
+                              if entry:match(replaced) then
+                                 found = true
+                                 break
+                              end
                            end
+                        else
+                           found = fs.is_file(dir.path(d, f))
+                        end
+                        if found then
+                           dirdata.dir = d
+                           break
                         end
-                     else
-                        found = fs.is_file(dir.path(dirdata.dir, f))
                      end
                      if found then
                         break
diff --git a/src/luarocks/fs/unix.lua b/src/luarocks/fs/unix.lua
index cccbbd33..cb5e634d 100644
--- a/src/luarocks/fs/unix.lua
+++ b/src/luarocks/fs/unix.lua
@@ -61,6 +61,14 @@ function wrap_script(file, dest, name, version)
    wrapper:write('LUA_PATH="'..package.path..';$LUA_PATH"\n')
    wrapper:write('LUA_CPATH="'..package.cpath..';$LUA_CPATH"\n')
    wrapper:write('export LUA_PATH LUA_CPATH\n')
+   wrapper:write('if [ -n "$LUA_PATH_5_2" ]; then\n')
+   wrapper:write('   LUA_PATH_5_2="'..package.path..';$LUA_PATH_5_2"\n')
+   wrapper:write('   export LUA_PATH_5_2\n')
+   wrapper:write('fi\n')
+   wrapper:write('if [ -n "$LUA_CPATH_5_2" ]; then\n')
+   wrapper:write('   LUA_CPATH_5_2="'..package.cpath..';$LUA_CPATH_5_2"\n')
+   wrapper:write('   export LUA_CPATH_5_2\n')
+   wrapper:write('fi\n')
    wrapper:write('exec "'..dir.path(cfg.variables["LUA_BINDIR"], cfg.lua_interpreter)..'" -lluarocks.loader -e\'luarocks.loader.add_context([['..name..']],[['..version..']])\' "'..file..'" "$@"\n')
    wrapper:close()
    if fs.chmod(wrapname, "0755") then