add entity patch

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = ignition-physics
 	pkgdesc = Abstract physics interface designed to support simulation and rapid development of robot applications.
 	pkgver = 3.1.0
-	pkgrel = 3
+	pkgrel = 4
 	url = https://ignitionrobotics.org/libs/physics
 	arch = x86_64
 	license = Apache
@@ -14,7 +14,9 @@ pkgbase = ignition-physics
 	depends = libdart
 	depends = sdformat
 	source = ignition-physics-3.1.0.tar.gz::https://github.com/ignitionrobotics/ign-physics/archive/ignition-physics3_3.1.0.tar.gz
+	source = entity.patch::https://patch-diff.githubusercontent.com/raw/ignitionrobotics/ign-physics/pull/185.patch
 	sha256sums = b8e5460d2808e20237b2ee0a6a6b7613b56412f5f6e2a5e153e48e8faae8ab77
+	sha256sums = SKIP
 
 pkgname = ignition-physics
 

PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=ignition-physics
 pkgver=3.1.0
-pkgrel=3
+pkgrel=4
 pkgdesc="Abstract physics interface designed to support simulation and rapid
 development of robot applications."
 arch=('x86_64')
@@ -11,30 +11,33 @@ license=('Apache')
 depends=('ignition-cmake' 'ignition-math' 'ignition-plugin' 'ignition-common'
          'libdart' 'sdformat')
 makedepends=('cmake' 'clang')
-source=("${pkgname}-${pkgver}.tar.gz::https://github.com/ignitionrobotics/ign-physics/archive/${pkgname}3_${pkgver}.tar.gz")
-sha256sums=('b8e5460d2808e20237b2ee0a6a6b7613b56412f5f6e2a5e153e48e8faae8ab77')
+source=("${pkgname}-${pkgver}.tar.gz::https://github.com/ignitionrobotics/ign-physics/archive/${pkgname}3_${pkgver}.tar.gz"
+        "entity.patch::https://patch-diff.githubusercontent.com/raw/ignitionrobotics/ign-physics/pull/185.patch")
+sha256sums=('b8e5460d2808e20237b2ee0a6a6b7613b56412f5f6e2a5e153e48e8faae8ab77'
+            'SKIP')
 
 _dir="ign-physics-${pkgname}3_${pkgver}"
 
+prepare() {
+  cd "$srcdir/$_dir"
+  patch --forward --strip=1 --input="${srcdir}/entity.patch"
+}
+
 build() {
   cd "$srcdir/$_dir"
 
   mkdir -p build
   cd build
 
-  # Configure build
   cmake .. -DCMAKE_BUILD_TYPE="Release" \
-           -DCMAKE_INSTALL_PREFIX="${pkgdir}/usr" \
+           -DCMAKE_INSTALL_PREFIX="/usr" \
            -DCMAKE_INSTALL_LIBDIR="lib" \
-           -DCMAKE_C_COMPILER=clang \
-           -DCMAKE_CXX_COMPILER=clang++ \
            -DBUILD_TESTING=OFF
 
-  # Compile
   make
 }
 
 package() {
   cd "$srcdir/$_dir/build"
-  make install
+  make DESTDIR="${pkgdir}/" install
 }