diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index fea9c11..1c74345 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -62,11 +62,32 @@ jobs:
         version: 9
 
     - name: Run Bash compatibility tests
+      run: |-
+        make --version;
+        make --file=config/Makefile.base --trace test-self;
+        
+  macos:
+    runs-on: macos-latest
+    steps:
+    # - name: Set up Docker
+    #   uses: crazy-max/ghaction-setup-docker@v3
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: 1.23.2
+
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Run MacOS compatibility tests
+      env:
+        BASH_COMPAT: 3.2
       run: |-
         make --version
-        make --file=config/Makefile.base --trace test-self
+        make --file=config/Makefile.base test-self
 
-  macos:
+  macos-updated:
     runs-on: macos-latest
     steps:
     # - name: Set up Docker
@@ -87,7 +108,8 @@ jobs:
         brew install make;
         export PATH="/opt/homebrew/opt/make/libexec/gnubin:${PATH}";
         make --version;
-        make --file=config/Makefile.base --trace test-self
+        make --file=config/Makefile.base --trace test-self;
+
 
   release:
     runs-on: ubuntu-latest
diff --git a/config/Makefile.base b/config/Makefile.base
index 26ec690..4f06e1c 100644
--- a/config/Makefile.base
+++ b/config/Makefile.base
@@ -2,10 +2,9 @@
 SHELL := /bin/bash
 
 # Setup variables for special purposes.
-NULL :=
 COMMA := ,
-SPACE := $(NULL) $(NULL)
-TAB := $(NULL)	$(NULL)
+SPACE := $(SPACE) $(SPACE)
+TAB := $(TAB)	$(TAB)
 define NEWLINE
 
 
@@ -46,14 +45,14 @@ endif
 
 # System depdendent helper functions.
 ifeq ("$(shell uname)","Linux")
-  MAKESHELL := PATH=$(PATH) /bin/bash
 else ifeq ($(shell uname),Darwin)
   path-setup = $(shell \
 	if [ "$(1)" == "opt" ]; then \
 	  XPATH="$(shell brew --prefix)/$(1)/$(2)/libexec/gnubin"; \
 	else XPATH="$(shell brew --prefix)/$(1)"; fi; \
 	test ! -e "$${XPATH}/$(3)" && brew install $(2) >&2; \
-	echo -n "$${XPATH}:$(4)")
+	if [ -n "$(4)" ]; then echo -n "$${XPATH}:$(4)"; \
+	else echo -n "$${XPATH}"; fi)
   export PATH := $(call path-setup,opt,coreutils,ls,$(PATH))
   export PATH := $(call path-setup,opt,findutils,find,$(PATH))
   export PATH := $(call path-setup,bin,bash,bash,$(PATH))
@@ -62,15 +61,21 @@ else ifeq ($(shell uname),Darwin)
   export PATH := $(call path-setup,opt,gsed,sed,$(PATH))
   export PATH := $(call path-setup,opt,make,make,$(PATH))
   # Ensure export of path to $(shell ...) in gmake 3.81.
-  MAKESHELL := PATH=$(PATH) /bin/bash
+  ifeq (3.81,$(MAKE_VERSION))
+	export SHELL :=  PATH="$(PATH)" $(shell brew --prefix)/bin/bash
+  else
+	export SHELL := $(shell brew --prefix)/bin/bash
+  endif
 else
   $(call cerror,unsupported operating system [$(shell uname --all)])
 endif
 
 # Log execution environment for debugging.
 $(call cdebug,$(shell uname --all))
+$(call cdebug,using PATH [$${PATH}])
+$(call cdebug,using SHELL [$${SHELL}])
 $(call cdebug,using BASH [$${0} - $${BASH_VERSION}])
-$(call cdebug,using PATH [$(shell echo -n "$${PATH}")])
+$(call cdebug,using AWK [$(shell awk --version | head -n 1)])
 
 # Helper function to find and remove source files.
 find-all = find $(1) ! -path "./run/*" ! -path "./build/*" \( $(2) \) 2>/dev/null | \
@@ -130,9 +135,11 @@ INSTALL_FLAGS ?= $(strip $(mod-readonly) -buildvcs=auto $(INSTALLFLAGS))
 
 
 # Function to ensure compatibility of gawk and mawk.
-ifneq ($(shell echo "false" | \
-	awk '{ print gensub("false","true","g") }' 2>/dev/null),true)
-  awk-gensub := function gensub(r, s, h, t) { \
+awk-gensub = $(shell echo "false" | \
+	awk '{ print gensub("false","true","g") }' 2>/dev/null)
+$(call cdebug,using GENSUB [$(awk-gensub)])
+ifneq ($(awk-gensub),true)
+  awk-gensub = function gensub(r, s, h, t) { \
 	  if (t == 0) { t = $$0 } \
 	  if (h ~ "^[gG]") { gsub(r, s, t) } \
 	  else if (int(h) != 0) { \
@@ -145,7 +152,7 @@ ifneq ($(shell echo "false" | \
 	  return t \
 	}
 else
-  awk-gensub :=
+  awk-gensub =
 endif