use ld_flags.py instead of python-configure

Author: Gerry Manoim

Makefile

@@ -62,10 +62,8 @@ CXXFLAGS = $(BASE_CXXFLAGS) $($(COMPILER)_FLAGS)
 
 # https://github.com/quantopian/libpy/pull/86/files#r309288697
 INCLUDE_DIRS := include/ \
-	$(shell $(PYTHON) -c "from distutils import sysconfig; \
-						  print(sysconfig.get_config_var('INCLUDEPY'))") \
-	$(shell $(PYTHON) -c "from distutils import sysconfig; \
-						  print(sysconfig.get_config_var('INCLUDEDIR'))") \
+	$(shell $(PYTHON) -c "import sysconfig; \
+						  print(sysconfig.get_config_var('INCLDIRSTOMAKE'))") \
 	$(shell $(PYTHON) -c 'import numpy as np;print(np.get_include())') \
 	$(EXTRA_INCLUDE_DIRS)
 INCLUDE := $(foreach d,$(INCLUDE_DIRS), -I$d)
@@ -92,7 +90,7 @@ else
 	CXXFLAGS += -fstack-protector-strong
 	SONAME_FLAG := soname
 	SONAME_PATH := $(SONAME)
-	LDFLAGS += $(shell $(PYTHON)-config --ldflags)
+	LDFLAGS += $(shell $(PYTHON) etc/ld_flags.py)
 	LDFLAGS += -lstdc++fs
 	LD_PRELOAD_VAR := LD_PRELOAD
 endif

etc/ld_flags.py

@@ -0,0 +1,14 @@
+# via https://github.com/python/cpython/blob/deb016224cc506503fb05e821a60158c83918ed4/Misc/python-config.in#L50 # noqa
+
+import sysconfig
+
+libs = []
+libpl = sysconfig.get_config_vars('LIBPL')
+if libpl:
+    libs.append("-L"+libpl[0])
+
+libpython = sysconfig.get_config_var('LIBPYTHON')
+if libpython:
+    libs.append(libpython)
+libs.extend(sysconfig.get_config_vars("LIBS", "SYSLIBS"))
+print(' '.join(libs))