debian/changelog

+libgdal-grass (2.3.0~rc1-1~exp1) experimental; urgency=medium
+
+  * New upstream release candidate.
+  * Enable parallel make.
+
+ -- Bas Couwenberg <sebastic@debian.org>  Fri, 04 May 2018 20:18:15 +0200
+
 libgdal-grass (2.3.0~beta1-1~exp1) experimental; urgency=medium
 
   * New upstream beta release.

debian/rules

@@ -19,6 +19,11 @@ GRASS=grass$(subst .,,$(shell pkg-config --modversion grass | cut -d. -f1,2))
 GRASS_ABI=grass$(subst .,,$(shell pkg-config --modversion grass | cut -d. -f1,2,3 | sed -e 's/RC/-/'))
 GDAL=$(shell cat VERSION | cut -d. -f1,2)
 
+NJOBS := -j1
+ifneq (,$(filter parallel=%,$(subst $(COMMA), ,$(DEB_BUILD_OPTIONS))))
+NJOBS := -j$(subst parallel=,,$(filter parallel=%,$(subst $(COMMA), ,$(DEB_BUILD_OPTIONS))))
+endif
+
 %:
 	dh $@ --with autoreconf --parallel
 
@@ -48,7 +53,8 @@ override_dh_auto_configure:
 override_dh_auto_install:
 	mkdir -p $(CURDIR)/debian/$(PKGNAME)/usr/lib/$(GDAL)/grass
 
-	$(MAKE) install AUTOLOAD_DIR=$(CURDIR)/debian/$(PKGNAME)/usr/lib/gdalplugins/$(GDAL) \
+	$(MAKE) $(NJOBS) install \
+		AUTOLOAD_DIR=$(CURDIR)/debian/$(PKGNAME)/usr/lib/gdalplugins/$(GDAL) \
 		GRASSTABLES_DIR=$(CURDIR)/debian/$(PKGNAME)/usr/lib/$(GDAL)/grass
 
 	# removes redundant stuff already installed by grass