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diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -10,6 +10,39 @@
All ports committers are allowed to commit to this file.
+20221217:
+AUTHOR: tcberner@FreeBSD.org
+
+ USES=llvm has been added to more easily depend on llvm.
+
+ USES=llvm supports two kinds of arguments:
+
+ * mode
+ <none>: defaults to build
+ build: add a BUILD_DEPENDS on chosen llvm-port
+ run: add a RUN_DEPENDS on chosen llvm-port
+ lib: add a LIB_DEPENDS on chosen llvm-port
+
+ * version
+ <none>: defaults to ${LLVM_DEFAULT}
+ number: use explicitly the specified version
+ min=number: use specified min if ${LLVM_DEFAULT} is lower
+ max=number: use specified max if ${LLVM_DEFAULT} is higher
+
+ An example usage might be:
+ USES= llvm
+ or
+ USES= llvm:13,build
+ or
+ USES= llvm:min=14,lib
+
+ The following variables are exposed to be used in the ports tree at the moment:
+ * LLVM_VERSION version chosen from the arguments to llvm.mk
+ * LLVM_PORT chosen llvm port
+ * LLVM_CONFIG llvm-config of the chosen port
+ * LLVM_LIBLLVM libLLVM.so of the chosen port
+ * LLVM_PREFIX installation prefix of the chosen port
+
20221026:
AUTHOR: bapt@FreeBSD.org
3 new features are available now: PIE, RELRO, BIND_NOW, each port can
diff --git a/Mk/Uses/llvm.mk b/Mk/Uses/llvm.mk
new file mode 100644
--- /dev/null
+++ b/Mk/Uses/llvm.mk
@@ -0,0 +1,98 @@
+# Provides support to depend on LLVM
+#
+# It chooses the llvm port to be used based on the following constraint:
+# 1) no constraints given => ${LLVM_DEFAULT}
+# 2) exact constraint given => ${exact}
+# 2) max constraint given && ${max} < ${LLVM_DEFAULT} => ${max}
+# 3) min constraint given && ${LLVM_DEFAULT} < ${LLVM_DEFAULT} => ${LLVM_DEFAULT}
+
+# Usage:
+# USES= llvm - default version chosen
+# USES= llvm:15 - exact constraint
+# USES= llvm:min=9 - min constraint: max(min,default)
+# USES= llvm:max=10 - max constraint: min(max,default)
+# USES= llvm:min=10,max=11 - all constraint: max(min(max,default),default)
+
+.if !defined(_INCLUDE_USES_LLVM_MK)
+_INCLUDE_USES_LLVM_MK= YES
+
+_LLVM_MK_VALID_VERSIONS= 7 8 9 10 11 12 13 14 15
+_LLVM_MK_VALID_CONSTRAINTS= min max
+_LLVM_MK_VALID_MODES= build run lib
+
+# === parse mode arguments ===
+_LLVM_MK_MODES= # empty
+. for _mode in ${_LLVM_MK_VALID_MODES}
+. if ${llvm_ARGS:M${_mode}}
+_LLVM_MK_MODES+= ${_mode}
+. endif
+. endfor
+. if empty(_LLVM_MK_MODES)
+_LLVM_MK_MODES= build
+. endif
+
+# === parse version arguments ===
+_LLVM_MK_VERSION= # empty
+. for _ver in ${_LLVM_MK_VALID_VERSIONS}
+. if ${llvm_ARGS:M${_ver}}
+. if !empty(_LLVM_MK_VERSION)
+BROKEN= USES=llvm:${llvm_ARGS} contains multiple version definitions
+. else
+_LLVM_MK_VERSION= ${_ver}
+. endif
+. endif
+. endfor
+. if empty(_LLVM_MK_VERSION)
+_LLVM_MK_VERSION= ${LLVM_DEFAULT}
+. endif
+
+# === handle constraints ===
+. for _constraint in ${_LLVM_MK_VALID_CONSTRAINTS}
+_version= ${llvm_ARGS:M${_constraint}=[0-9]*:S/${_constraint}=//}
+. if !empty(_version)
+_LLVM_MK_CONSTRAINT_${_constraint}= ${_version}
+. endif
+. endfor
+
+. if !empty(_LLVM_MK_CONSTRAINT_min)
+. if ${_LLVM_MK_CONSTRAINT_min} > ${_LLVM_MK_VERSION}
+_LLVM_MK_VERSION= ${_LLVM_MK_CONSTRAINT_min}
+. endif
+. endif
+
+. if !empty(_LLVM_MK_CONSTRAINT_max)
+. if ${_LLVM_MK_CONSTRAINT_max} < ${_LLVM_MK_VERSION}
+_LLVM_MK_VERSION= ${_LLVM_MK_CONSTRAINT_max}
+. endif
+. endif
+
+# === define helpers for the dependencies ===
+. for _ver in ${_LLVM_MK_VALID_VERSIONS:N1[0-9]}
+_LLVM_MK_SUFFIX_${_ver}= ${_ver}0
+. endfor
+
+. for _ver in ${_LLVM_MK_VALID_VERSIONS}
+_LLVM_MK_SUFFIX_${_ver}?= ${_ver}
+. endfor
+
+# === define variables to depend on and export ===
+_LLVM_MK_PORT= devel/llvm${_LLVM_MK_SUFFIX_${_LLVM_MK_VERSION}}
+_LLVM_MK_LIBLLVM= libLLVM-${_LLVM_MK_VERSION}.so
+_LLVM_MK_PATH= llvm-config${_LLVM_MK_SUFFIX_${_LLVM_MK_VERSION}}
+_LLVM_MK_PREFIX= ${PREFIX}/llvm${_LLVM_MK_SUFFIX_${_LLVM_MK_VERSION}}
+
+# == add actual dependencies ===
+_LLVM_MK_PATH_lib= ${_LLVM_MK_LIBLLVM}
+. for _mode in ${_LLVM_MK_MODES}
+_LLVM_MK_PATH_${_mode}?= ${_LLVM_MK_PATH}
+${_mode:tu}_DEPENDS+= ${_LLVM_MK_PATH_${_mode}}:${_LLVM_MK_PORT}
+. endfor
+
+# == export config ===
+LLVM_PORT= ${_LLVM_MK_PORT}
+LLVM_CONFIG= ${_LLVM_MK_PATH}
+LLVM_LIBLLVM= ${_LLVM_MK_LIBLLVM}
+LLVM_VERSION= ${_LLVM_MK_VERSION}
+LLVM_PREFIX= ${_LLVM_MK_PREFIX}
+
+.endif

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