diff --git a/src/Makefile b/src/Makefile
index 058a006..683b0d1 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3,23 +3,12 @@ objfiles:=$(patsubst %.cpp,%.o,$(sourcefiles))
 
 
 
-CXX = g++10
-#CXX = clang++
-#CXXFLAGS = -fsanitize=address -O0 -g3 -gdwarf-2 -O0 -std=c++14 -I../ttmath -I../pikotools -Wl,-rpath=/usr/local/lib/gcc5/ -Wall -pedantic -Wextra
-#CXXFLAGS = -O0 -g3 -gdwarf-2 -O0 -std=c++17 -I../ttmath -I../pikotools -Wl,-rpath=/usr/local/lib/gcc7/ -Wall -pedantic -Wextra
-CXXFLAGS = -Wl,-rpath=/usr/local/lib/gcc10/ -O0 -g3 -std=c++20 -I../pikotools -Wall -pedantic
-
-
 ifndef CXX
-CXX = clang++
+CXX = g++
 endif
 
 ifndef CXXFLAGS
-CXXFLAGS = -Wall -O2 -I/usr/local/include
-endif
-
-ifndef LDFLAGS
-LDFLAGS = -L/usr/local/lib
+CXXFLAGS = -Wall -pedantic -O2 -std=c++20 -I../src -I/usr/local/include
 endif
 
 ifndef AR
@@ -27,10 +16,6 @@ AR = ar
 endif
 
 
-#export CXX
-#export CXXFLAGS
-#export LDFLAGS
-#export AR
 
 
 libname = pikotools.a