install failure.

[microprediction]

Seen this before

building 'accumulation_tree.accumulation_tree' extension
creating build/temp.linux-x86_64-3.7
creating build/temp.linux-x86_64-3.7/accumulation_tree
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/nfs/i1/c/home/peter/virtual-envs/optim/include -I/usr/include/python3.7m -c accumulation_tree/accumulation_tree.c -o build/temp.linux-x86_64-3.7/accumulation_tree/accumulation_tree.o
accumulation_tree/accumulation_tree.c:4:10: fatal error: Python.h: No such file or directory
#include "Python.h"
^~~~~~~~~~
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

---

Failed building wheel for accumulation-tree
Running setup.py clean for accumulation-tree
Failed to build accumulation-tree
Installing collected packages: contexttimer, muid, contextlib2, schema, pymorton, ordered-set, deepdiff, accumulation-tree, tdigest, microconventions, microprediction
^COperation cancelled by user

[microprediction]

Hmmm ...how ro reproduce?