diff --git a/srcpkgs/Clight/patches/fix-musl.patch b/srcpkgs/Clight/patches/fix-musl.patch
new file mode 100644
index 00000000000..ffd80ed7152
--- /dev/null
+++ b/srcpkgs/Clight/patches/fix-musl.patch
@@ -0,0 +1,10 @@
+--- src/utils/log.c.orig
++++ src/utils/log.c
+@@ -1,5 +1,7 @@
++#include <sys/types.h>
+ #include <sys/file.h>
+ #include <sys/stat.h>
++#include <fcntl.h>
+ #include "commons.h"
+ 
+ static FILE *log_file;
diff --git a/srcpkgs/Clight/patches/issue-70.patch b/srcpkgs/Clight/patches/issue-70.patch
deleted file mode 100644
index a71e895de74..00000000000
--- a/srcpkgs/Clight/patches/issue-70.patch
+++ /dev/null
@@ -1,35 +0,0 @@
-From 8491e18e940a71a74874885436691e2443b21844 Mon Sep 17 00:00:00 2001
-From: Federico Di Pierro <nierro92@gmail.com>
-Date: Mon, 18 Mar 2019 20:24:48 +0100
-Subject: [PATCH] Avoid flaot libsystemd/libelogind version. Fixes #70.
-
----
- CMakeLists.txt | 8 +++++++-
- 1 file changed, 7 insertions(+), 1 deletion(-)
-
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 9d6f173..f6e0c3d 100644
---- CMakeLists.txt
-+++ CMakeLists.txt
-@@ -34,6 +34,12 @@ set_property(TARGET ${PROJECT_NAME} PROPERTY C_STANDARD 99)
- # Required dependencies
- pkg_check_modules(REQ_LIBS REQUIRED popt gsl libconfig)
- pkg_search_module(LOGIN_LIBS REQUIRED libelogind libsystemd>=221)
-+
-+# Avoid float versioning for libsystemd/libelogind
-+string(REPLACE "." ";" LOGIN_LIBS_VERSION_LIST ${LOGIN_LIBS_VERSION})
-+list(GET LOGIN_LIBS_VERSION_LIST 0 LOGIN_LIBS_VERSION_MAJOR)
-+message(STATUS "Found lib${LOGIN_LIBS_LIBRARIES} version ${LOGIN_LIBS_VERSION_MAJOR}")
-+
- target_link_libraries(${PROJECT_NAME}
-                       m
-                       ${REQ_LIBS_LIBRARIES}
-@@ -44,7 +50,7 @@ target_include_directories(${PROJECT_NAME} PRIVATE
-                            "${LOGIN_LIBS_INCLUDE_DIRS}"
- )
- target_compile_definitions(${PROJECT_NAME} PRIVATE
--    -DLIBSYSTEMD_VERSION=${LOGIN_LIBS_VERSION}
-+    -DLIBSYSTEMD_VERSION=${LOGIN_LIBS_VERSION_MAJOR}
- )
- list(APPEND COMBINED_LDFLAGS ${REQ_LIBS_LDFLAGS})
- list(APPEND COMBINED_LDFLAGS ${LOGIN_LIBS_LDFLAGS})
diff --git a/srcpkgs/Clight/template b/srcpkgs/Clight/template
index 9919d510abb..4d1e98b8b86 100644
--- a/srcpkgs/Clight/template
+++ b/srcpkgs/Clight/template
@@ -1,14 +1,15 @@
 # Template file for 'Clight'
 pkgname=Clight
-version=3.1
-revision=2
+version=4.0
+revision=1
 build_style=cmake
 hostmakedepends="pkg-config"
-makedepends="popt-devel gsl-devel libconfig-devel elogind-devel bash-completion dbus-devel"
+makedepends="popt-devel gsl-devel libconfig-devel elogind-devel bash-completion
+ dbus-devel libmodule-devel"
 depends="Clightd"
 short_desc="Use your webcam as a light sensor to adjust screen backlight"
 maintainer="Dominic Monroe <monroef4@googlemail.com>"
 license="GPL-3.0-or-later"
 homepage="https://github.com/FedeDP/Clight"
 distfiles="https://github.com/FedeDP/Clight/archive/${version}.tar.gz"
-checksum=842e639b86f898da225104878543b97d2626a3326e663f84333d075f9e718b89
+checksum=ae1deba71d376b14acc2a7495b1a6a4ed43fa438c59c1d4fcb2648d44964bd71