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+# choose your compiler, e.g. gcc/clang
+# example override to clang: make run CC=clang
+CC = gcc
+
+# the most basic way of building that is most likely to work on most systems
+.PHONY: run
+run: run.c
+	$(CC) -O3 -o run run.c -lm
+	$(CC) -O3 -o runq runq.c -lm
+
+# useful for a debug build, can then e.g. analyze with valgrind, example:
+# $ valgrind --leak-check=full ./run out/model.bin -n 3
+rundebug: run.c
+	$(CC) -g -o run run.c -lm
+	$(CC) -g -o runq runq.c -lm
+
+# https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
+# https://simonbyrne.github.io/notes/fastmath/
+# -Ofast enables all -O3 optimizations.
+# Disregards strict standards compliance.
+# It also enables optimizations that are not valid for all standard-compliant programs.
+# It turns on -ffast-math, -fallow-store-data-races and the Fortran-specific
+# -fstack-arrays, unless -fmax-stack-var-size is specified, and -fno-protect-parens.
+# It turns off -fsemantic-interposition.
+# In our specific application this is *probably* okay to use
+.PHONY: runfast
+runfast: run.c
+	$(CC) -Ofast -o run run.c -lm
+	$(CC) -Ofast -o runq runq.c -lm
+
+# additionally compiles with OpenMP, allowing multithreaded runs
+# make sure to also enable multiple threads when running, e.g.:
+# OMP_NUM_THREADS=4 ./run out/model.bin
+.PHONY: runomp
+runomp: run.c
+	$(CC) -Ofast -fopenmp -march=native run.c  -lm  -o run
+	$(CC) -Ofast -fopenmp -march=native runq.c  -lm  -o runq
+
+.PHONY: win64
+win64:
+	x86_64-w64-mingw32-gcc -Ofast -D_WIN32 -o run.exe -I. run.c win.c
+	x86_64-w64-mingw32-gcc -Ofast -D_WIN32 -o runq.exe -I. runq.c win.c
+
+# compiles with gnu99 standard flags for amazon linux, coreos, etc. compatibility
+.PHONY: rungnu
+rungnu:
+	$(CC) -Ofast -std=gnu11 -o run run.c -lm
+	$(CC) -Ofast -std=gnu11 -o runq runq.c -lm
+
+.PHONY: runompgnu
+runompgnu:
+	$(CC) -Ofast -fopenmp -std=gnu11 run.c  -lm  -o run
+	$(CC) -Ofast -fopenmp -std=gnu11 runq.c  -lm  -o runq
+
+# run all tests
+.PHONY: test
+test:
+	pytest
+
+# run only tests for run.c C implementation (is a bit faster if only C code changed)
+.PHONY: testc
+testc:
+	pytest -k runc
+
+# run the C tests, without touching pytest / python
+# to increase verbosity level run e.g. as `make testcc VERBOSITY=1`
+VERBOSITY ?= 0
+.PHONY: testcc
+testcc:
+	$(CC) -DVERBOSITY=$(VERBOSITY) -O3 -o testc test.c -lm
+	./testc
+
+.PHONY: clean
+clean:
+	rm -f run
+	rm -f runq