libspatialindex: clean up

sci-libs/libspatialindex/libspatialindex-1.9.3.recipe

@@ -3,7 +3,7 @@ DESCRIPTION="Extensible framework that supports robust spatial indexing methods
 HOMEPAGE="https://libspatialindex.org/"
 COPYRIGHT="Marios Hadjieleftheriou"
 LICENSE="MIT"
-REVISION="2"
+REVISION="3"
 SOURCE_URI="https://github.com/libspatialindex/libspatialindex/releases/download/$portVersion/spatialindex-src-$portVersion.tar.bz2"
 CHECKSUM_SHA256="4a529431cfa80443ab4dcd45a4b25aebbabe1c0ce2fa1665039c80e999dcc50a"
 SOURCE_DIR="spatialindex-src-$portVersion"
@@ -54,16 +54,14 @@ BUILD_PREREQUIRES="
 
 BUILD()
 {
-	mkdir -p build
-	cd build
-	cmake .. $cmakeDirArgs -DCMAKE_BUILD_TYPE=Release -DSIDX_BUILD_TESTS=ON
-	make $jobArgs
+	cmake -Bbuild -S. -DCMAKE_BUILD_TYPE=Release \
+		$cmakeDirArgs -DSIDX_BUILD_TESTS=ON
+	make -C build $jobArgs
 }
 
 INSTALL()
 {
-	cd build
-	make install
+	make -C build install
 
 	mkdir -p $includeDir
 	mv $prefix/include/spatialindex $includeDir