Added pattern function so we can match whatever llvm versions we want

Right now we match every version that is 13 something for arm64 on macOS
And for x86 we allow any above 11 and including 11

Makefile

@@ -8,25 +8,33 @@ CC=clang
 OS=$(shell uname)
 
 ifeq ($(OS), Darwin)
+    
     ARCH=$(shell uname -m)
-    LLVM_CONFIG=llvm-config
+    LLVM_CONFIG=
 
+    # allow for arm only llvm's with version 13
     ifeq ($(ARCH), arm64)
-        ifneq ($(shell llvm-config --version | grep "^13\."),)
-            LLVM_CONFIG=llvm-config
-        else
-            $(error "Requirement: llvm-config must be version llvm 13 for arm64")
-        endif
+        LLVM_VERSIONS = "13.%.%"
     else
-        ifneq ($(shell llvm-config --version | grep "^11\."),)
-            LLVM_CONFIG=llvm-config
-        else ifneq ($(shell llvm-config --version | grep "^12\."),)
-            LLVM_CONFIG=llvm-config
-        else ifneq ($(shell llvm-config --version | grep "^13\."),)
-            LLVM_CONFIG=llvm-config
-        else
-            $(error "Requirement: llvm-config must be version llvm 11 or 12 or 13 for amd64/x86")
-        endif
+    # allow for x86 / amd64 all llvm versions begining from 11
+        LLVM_VERSIONS = "13.%.%" "12.0.1" "11.1.0" "11.0.1" "11.0.0"
+    endif
+
+    LLVM_VERSION_PATTERN_SEPERATOR = )|(
+    LLVM_VERSION_PATTERNS_ESCAPED_DOT = $(subst .,\.,$(LLVM_VERSIONS))
+    LLVM_VERSION_PATTERNS_REPLACE_PERCENT = $(subst %,.,$(LLVM_VERSION_PATTERNS_ESCAPED_DOT))
+    LLVM_VERSION_PATTERN_REMOVE_ELEMENTS = $(subst " ",$(LLVM_VERSION_PATTERN_SEPERATOR),$(LLVM_VERSION_PATTERNS_REPLACE_PERCENT))
+    LLMV_VERSION_PATTERN_REMOVE_SINGLE_STR = $(subst ",,$(LLVM_VERSION_PATTERN_REMOVE_ELEMENTS))
+    LLVM_VERSION_PATTERN = "^(($(LLMV_VERSION_PATTERN_REMOVE_SINGLE_STR)))"
+
+    ifneq ($(shell llvm-config --version | grep -E $(LLVM_VERSION_PATTERN)),)
+        LLVM_CONFIG=llvm-config
+    else
+        ifeq ($(ARCH), arm64)
+            $(error "Requirement: llvm-config must be base version 13 for arm64")
+        else 
+            $(error "Requirement: llvm-config must be base version greater than 11 for amd64/x86")
+        endif 
     endif 
 
     LDFLAGS:=$(LDFLAGS) -liconv