build/pkgs/python3/spkg-build.in: Make sure that python finds sqlite3…

… when determining which extension modules to build

build/pkgs/python3/spkg-build.in

@@ -84,8 +84,13 @@ sdh_configure --enable-shared $PYTHON_CONFIGURE
 # Make sure -L. is placed before -L$SAGE_LOCAL/lib so that python and extension
 # modules are linked with the right libpython; we pass this in at make time
 # only, since we don't want -L. to be saved as one of the default LDFLAGS
-# used for building third-party extension modules
-sdh_make LDFLAGS="-L. $LDFLAGS"
+# used for building third-party extension modules.
+#
+# Trac #32442: As we now install python in SAGE_VENV, not SAGE_LOCAL,
+# we need to provide paths into $SAGE_LOCAL, so that setup.py finds
+# the libraries needed for the extension modules - in particular sqlite3.
+# (The search code there does not know about CPATH and LIBRARY_PATH.)
+sdh_make LDFLAGS="-L. -L$SAGE_LOCAL/lib $LDFLAGS" CPPFLAGS="-I$SAGE_LOCAL/include $CPPFLAGS"
 
 if [ "$UNAME" = "Darwin" ]; then
     export DYLD_LIBRARY_PATH="."