diff --git a/Makefile b/Makefile
index f84d2f2..53f131c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,25 @@
-CXX = clang++
+ifeq ($(shell which root-config),)
+  ROOT = $(HOME)/root_build/debug
+  $(info Cannot find root-config: guessing the root is $(ROOT). Please source thisroot.sh)
+  ROOTINCDIR = $(ROOT)/include
+  ROOTLIBDIR = $(ROOT)/lib
+else
+  ROOTINCDIR = $(shell root-config --incdir)
+  ROOTLIBDIR = $(shell root-config --libdir)
+endif
+
 CFLAGS = -Wall -Wextra -pedantic
 INC = -Ithird_party -Ithird_party/imgui
-ROOT = $(HOME)/root_build/debug
-ROOTFLAGS = -std=c++17 -m64 -I$(ROOT)/include
-ROOTLIBS = -L$(ROOT)/lib -lCore -lRIO -lROOTNTuple -lxxhash -Wl,-rpath,$(ROOT)/lib -pthread 
 LIBS = -lglfw
-MOLD = mold -run
-# ROOT_IFACE = build/libroot_iface.so
-# ROOT_IFACE_DBG = build/libroot_iface_d.so
+
+ROOTFLAGS = -std=c++17 -m64 -I$(ROOTINCDIR)
+ROOTLIBS = -L$(ROOTLIBDIR) -lCore -lRIO -lROOTNTuple -lxxhash -pthread 
+
+ifeq ($(shell which mold),)
+  MOLD =
+else
+  MOLD = mold -run
+endif
 ROOT_IFACE = build/RMicroFileReader.o
 ROOT_IFACE_DBG = $(ROOT_IFACE)
 
@@ -23,20 +35,17 @@ build/imgui.o: src/imgui_inc.cpp third_party/imgui/imgui.h
 $(ROOT_IFACE): src/root/RMicroFileReader.cxx
 	$(CXX) -O3 -fPIC -c $(ROOTFLAGS) $< -o $@
 
-# $(ROOT_IFACE): src/root/RMicroFileReader.cxx src/root/RMicroFileReader.hxx
-# 	$(CXX) -O3 -fPIC -shared $(ROOTFLAGS) $< -o $@ $(ROOTLIBS)
-
-# $(ROOT_IFACE_DBG): src/root/RMicroFileReader.cxx src/root/RMicroFileReader.hxx
-# 	$(CXX) -g -O0 -fPIC -shared $(ROOTFLAGS) $< -o $@ $(ROOTLIBS)
-
+# debug build
 d: $(ROOT_IFACE_DBG) build/imgui.o
 	$(MOLD) $(CXX) -DDEBUG -g -O0 -DENABLE_ASAN $(CFLAGS) $(INC) $(ROOTFLAGS) -o rntviewer src/rntviewer.cpp build/imgui.o -lasan $(ROOT_IFACE_DBG) $(LIBS) $(ROOTLIBS)
+
+# release build
+r: $(ROOT_IFACE) build/imgui.o
+	$(MOLD) $(CXX) -O2 -DNDEBUG $(CFLAGS) $(INC) $(ROOTFLAGS) -o rntviewer src/rntviewer.cpp build/imgui.o $(ROOT_IFACE) $(LIBS) $(ROOTLIBS)
 	
+# sanitizers
 asan: $(ROOT_IFACE_DBG) build/imgui.o
 	$(MOLD) $(CXX) -DDEBUG -g -O0 $(CFLAGS) -fsanitize=address $(INC) $(ROOTFLAGS) -o rntviewer src/rntviewer.cpp build/imgui.o $(ROOT_IFACE_DBG) $(LIBS) $(ROOTLIBS)
 
-noasan: $(ROOT_IFACE_DBG) build/imgui.o
+ubsan: $(ROOT_IFACE_DBG) build/imgui.o
 	$(MOLD) $(CXX) -DDEBUG -g -O0 $(CFLAGS) -fsanitize=undefined $(INC) $(ROOTFLAGS) -o rntviewer src/rntviewer.cpp build/imgui.o $(ROOT_IFACE_DBG) $(LIBS) $(ROOTLIBS)
-
-r: $(ROOT_IFACE) build/imgui.o
-	$(MOLD) $(CXX) -O2 -DNDEBUG $(CFLAGS) $(INC) $(ROOTFLAGS) -o rntviewer src/rntviewer.cpp build/imgui.o $(ROOT_IFACE) $(LIBS) $(ROOTLIBS)