patch for https://aur.archlinux.org/packages/rr

diff --git a/0000_cmake_empty_var.patch b/0000_cmake_empty_var.patch
new file mode 100644
index 0000000..8738eaa
--- /dev/null
+++ b/0000_cmake_empty_var.patch
@@ -0,0 +1,25 @@
+From e587525aa099e7e1776418192fe8709dd355b0a0 Mon Sep 17 00:00:00 2001
+From: Dan Shechter <[email protected]>
+Date: Thu, 29 Oct 2020 21:51:12 +0200
+Subject: [PATCH] Help modern cmake versions deal with empty
+
+---
+ CMakeLists.txt | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index d03dc7508..821f28407 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -599,9 +599,9 @@ else()
+   target_link_libraries(rr ${CAPNP_LDFLAGS})
+ endif()
+
+-set_target_properties(rr PROPERTIES LINK_FLAGS ${RR_MAIN_LINKER_FLAGS})
++set_target_properties(rr PROPERTIES LINK_FLAGS "${RR_MAIN_LINKER_FLAGS}")
+ if(RR_BUILD_SHARED)
+-  set_target_properties(rrbin PROPERTIES LINK_FLAGS ${RR_MAIN_LINKER_FLAGS})
++  set_target_properties(rrbin PROPERTIES LINK_FLAGS "${RR_MAIN_LINKER_FLAGS}")
+ endif()
+
+ target_link_libraries(rrpreload
diff --git a/PKGBUILD b/PKGBUILD
index 023a46c..d2e9ae0 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -15,11 +15,14 @@ options=(!strip)

 source=(
        $pkgname-$pkgver.tar.gz::https://github.com/rr-debugger/${pkgname}/archive/${pkgver}.tar.gz
+       0000_cmake_empty_var.patch
 )
-sha1sums=('b4716dd10b01ae4b8d35ae08f4f67fc46f0693d9')
+sha1sums=('b4716dd10b01ae4b8d35ae08f4f67fc46f0693d9'
+          '129f08d1632820558f686a9326cadb663ac92144')

 prepare() {
        cd $pkgname-$pkgver
+       patch --forward --strip=1 --input="${srcdir}/0000_cmake_empty_var.patch"
        mkdir -p build
 }