Prefix execution of install.py with Python binary

Fixes GH #1297

This is done even on GNU make builds, since the same issue
affects MinGW

3 files changed, 4 insertions, 2 deletions

diff --git a/src/build-data/makefile/gmake.in b/src/build-data/makefile/gmake.in
index 70b534503..a943392ba 100644
--- a/src/build-data/makefile/gmake.in
+++ b/src/build-data/makefile/gmake.in
@@ -79,4 +79,4 @@ docs:
 %{build_doc_commands}
 
 install: $(CLI) docs
-	$(SCRIPTS_DIR)/install.py --prefix=%{prefix} --build-dir="%{build_dir}" --bindir=%{bindir} --libdir=%{libdir} --docdir=%{docdir} --includedir=%{includedir}
+	$(PYTHON_EXE) $(SCRIPTS_DIR)/install.py --prefix=%{prefix} --build-dir="%{build_dir}" --bindir=%{bindir} --libdir=%{libdir} --docdir=%{docdir} --includedir=%{includedir}
diff --git a/src/build-data/makefile/header.in b/src/build-data/makefile/header.in
index a63a83f3a..6757abbad 100644
--- a/src/build-data/makefile/header.in
+++ b/src/build-data/makefile/header.in
@@ -2,6 +2,8 @@
 CXX            = %{cxx} %{cxx_abi_flags}
 LINKER         = %{linker}
 
+PYTHON_EXE     = %{python_exe}
+
 CXXFLAGS       = %{cc_compile_flags}
 WARN_FLAGS     = %{cc_warning_flags}
 SO_OBJ_FLAGS   = %{shared_flags}
diff --git a/src/build-data/makefile/nmake.in b/src/build-data/makefile/nmake.in
index f5ecde341..b721ffd67 100644
--- a/src/build-data/makefile/nmake.in
+++ b/src/build-data/makefile/nmake.in
@@ -102,4 +102,4 @@ distclean: clean
 	$(RM) Makefile $(LIB_BASENAME).* $(CLI).*
 
 install: $(CLI) docs
-	$(SCRIPTS_DIR)\install.py --prefix=%{prefix} --build-dir="%{build_dir}" --bindir=%{bindir} --libdir=%{libdir} --docdir=%{docdir} --includedir=%{includedir}
+	$(PYTHON_EXE) $(SCRIPTS_DIR)\install.py --prefix=%{prefix} --build-dir="%{build_dir}" --bindir=%{bindir} --libdir=%{libdir} --docdir=%{docdir} --includedir=%{includedir}