diff --git a/Makefile b/Makefile
index 1a430277f..50b189081 100644
--- a/Makefile
+++ b/Makefile
@@ -71,6 +71,7 @@ CXXFLAGS += -I$(BREW_PREFIX)/readline/include
 LDFLAGS += -L$(BREW_PREFIX)/readline/lib
 
 PKG_CONFIG_PATH := $(BREW_PREFIX)/libffi/lib/pkgconfig:$(PKG_CONFIG_PATH)
+PKG_CONFIG_PATH := $(BREW_PREFIX)/tcl-tk/lib/pkgconfig:$(PKG_CONFIG_PATH)
 
 export PATH := $(BREW_PREFIX)/bison/bin:$(BREW_PREFIX)/gettext/bin:$(BREW_PREFIX)/flex/bin:$(PATH)
 
@@ -225,15 +226,16 @@ endif
 endif
 
 ifeq ($(ENABLE_PLUGINS),1)
-CXXFLAGS += -DYOSYS_ENABLE_PLUGINS $(shell PKG_CONFIG_PATH=$(PKG_CONFIG_PATH) $(PKG_CONFIG) --silence-errors --cflags libffi)
+CXXFLAGS += $(shell PKG_CONFIG_PATH=$(PKG_CONFIG_PATH) $(PKG_CONFIG) --silence-errors --cflags libffi) -DYOSYS_ENABLE_PLUGINS
 LDLIBS += $(shell PKG_CONFIG_PATH=$(PKG_CONFIG_PATH) $(PKG_CONFIG) --silence-errors --libs libffi || echo -lffi) -ldl
 endif
 
 ifeq ($(ENABLE_TCL),1)
 TCL_VERSION ?= tcl$(shell bash -c "tclsh <(echo 'puts [info tclversion]')")
 TCL_INCLUDE ?= /usr/include/$(TCL_VERSION)
-CXXFLAGS += -I$(TCL_INCLUDE) -DYOSYS_ENABLE_TCL
-LDLIBS += -l$(TCL_VERSION)
+
+CXXFLAGS += $(shell PKG_CONFIG_PATH=$(PKG_CONFIG_PATH) $(PKG_CONFIG) --silence-errors --cflags tcl || echo -I$(TCL_INCLUDE)) -DYOSYS_ENABLE_TCL
+LDLIBS += $(shell PKG_CONFIG_PATH=$(PKG_CONFIG_PATH) $(PKG_CONFIG) --silence-errors --libs tcl || echo -l$(TCL_VERSION))
 endif
 
 ifeq ($(ENABLE_GPROF),1)