lua: improve configure checks

The base 'lua' library has different names on different OS' and even
Linux distro's. Instead of selecting the proper one, we now just try
all. This way no OS/distro specific knowledge about the name is needed.

configure.ac

@@ -1496,7 +1496,16 @@
         if test "$with_liblua_includes" != "no"; then
             CPPFLAGS="${CPPFLAGS} -I${with_liblua_includes}"
         else
-            PKG_CHECK_MODULES([LUA], [${LUA_PC_NAME}], LUA="no")
+            # lua lua51 lua5.1 lua-5.1
+            PKG_CHECK_MODULES([LUA], [lua], [LUA="yes"], [
+                PKG_CHECK_MODULES([LUA], [lua5.1], [LUA="yes"], [
+                    PKG_CHECK_MODULES([LUA], [lua-5.1], [LUA="yes"], [
+                        PKG_CHECK_MODULES([LUA], [lua51], [LUA="yes"], [
+                            LUA="no"
+                        ])
+                    ])
+                ])
+            ])
             CPPFLAGS="${CPPFLAGS} ${LUA_CFLAGS}"
         fi
 
@@ -1504,19 +1513,14 @@
         if test "$LUA" = "yes"; then
             if test "$with_liblua_libraries" != "no"; then
                 LDFLAGS="${LDFLAGS}  -L${with_liblua_libraries}"
-            else
-                PKG_CHECK_MODULES([LUA], [${LUA_PC_NAME}])
-                LDFLAGS="${LDFLAGS} ${LUA_LIBS}"
-            fi
-
                 AC_CHECK_LIB(${LUA_LIB_NAME}, luaL_openlibs,, LUA="no")
-
                 if test "$LUA" = "no"; then
                     echo
                     echo "   ERROR!  liblua library not found, go get it"
                     echo "   from http://lua.org/index.html or your distribution:"
                     echo
                     echo "   Ubuntu: apt-get install liblua-5.1-dev"
+                    echo "   CentOS/Fedora: yum install lua-devel"
                     echo
                     echo "   If you installed software in a non-standard prefix"
                     echo "   consider adjusting the PKG_CONFIG_PATH environment variable"
@@ -1524,6 +1528,19 @@
                     echo
                     exit 1
                 fi
+            else
+                # lua lua51 lua5.1 lua-5.1
+                PKG_CHECK_MODULES([LUA], [lua], [LUA="yes"], [
+                    PKG_CHECK_MODULES([LUA], [lua5.1], [LUA="yes"], [
+                        PKG_CHECK_MODULES([LUA], [lua-5.1], [LUA="yes"], [
+                            PKG_CHECK_MODULES([LUA], [lua51], [LUA="yes"], [
+                                LUA="no"
+                            ])
+                        ])
+                    ])
+                ])
+                LDFLAGS="${LDFLAGS} ${LUA_LIBS}"
+            fi
 
             AC_DEFINE([HAVE_LUA],[1],[liblua available])
             enable_lua="yes"
@@ -1533,6 +1550,7 @@
                 echo "   from http://lua.org/index.html or your distribution:"
                 echo
                 echo "   Ubuntu: apt-get install liblua-5.1-dev"
+                echo "   CentOS/Fedora: yum install lua-devel"
                 echo
                 echo "   If you installed software in a non-standard prefix"
                 echo "   consider adjusting the PKG_CONFIG_PATH environment variable"