diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5d15a3548..0786637b9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,7 +19,7 @@
 # along with WeeChat.  If not, see <https://www.gnu.org/licenses/>.
 #
 
-cmake_minimum_required(VERSION 3.18)
+cmake_minimum_required(VERSION 3.16)
 
 project(weechat C)
 
diff --git a/debian-devel/rules b/debian-devel/rules
index 086056f76..559ccfffb 100755
--- a/debian-devel/rules
+++ b/debian-devel/rules
@@ -8,6 +8,7 @@ override_dh_auto_configure:
 	dh_auto_configure --buildsystem=cmake -- \
 		-DCMAKE_INSTALL_PREFIX:FILEPATH=/usr \
 		-DLIBDIR=/usr/lib/${DEB_HOST_MULTIARCH} \
+		-DENABLE_CJSON:BOOL=OFF \
 		-DENABLE_DOC:BOOL=ON \
 		-DENABLE_MAN:BOOL=ON \
 		-DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
diff --git a/debian-stable/rules b/debian-stable/rules
index 086056f76..559ccfffb 100755
--- a/debian-stable/rules
+++ b/debian-stable/rules
@@ -8,6 +8,7 @@ override_dh_auto_configure:
 	dh_auto_configure --buildsystem=cmake -- \
 		-DCMAKE_INSTALL_PREFIX:FILEPATH=/usr \
 		-DLIBDIR=/usr/lib/${DEB_HOST_MULTIARCH} \
+		-DENABLE_CJSON:BOOL=OFF \
 		-DENABLE_DOC:BOOL=ON \
 		-DENABLE_MAN:BOOL=ON \
 		-DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
diff --git a/src/plugins/ruby/CMakeLists.txt b/src/plugins/ruby/CMakeLists.txt
index 9f921fde8..2860f7d6d 100644
--- a/src/plugins/ruby/CMakeLists.txt
+++ b/src/plugins/ruby/CMakeLists.txt
@@ -28,8 +28,8 @@ if(RUBY_FOUND)
   # caused by Ruby headers (with Ruby ≥ 3.1.0)
   # see: https://github.com/ruby/ruby/pull/7085
   add_definitions(-Wno-unused-parameter)
-  include_directories(${Ruby_INCLUDE_DIRS})
-  target_link_libraries(ruby ${Ruby_LIBRARIES} weechat_plugins_scripts coverage_config)
+  include_directories(${RUBY_INCLUDE_DIRS})
+  target_link_libraries(ruby ${RUBY_LIBRARY} weechat_plugins_scripts coverage_config)
 endif(RUBY_FOUND)
 
 install(TARGETS ruby LIBRARY DESTINATION "${WEECHAT_LIBDIR}/plugins")