--- configure.orig	2019-04-29 06:51:49.000000000 +0800
+++ configure	2023-07-11 13:23:08.000000000 +0800
@@ -2721,7 +2721,7 @@
              ## we know this one is bad
              can_use_openmp="no"
         ;;
-        5.4*|5.5*|5.6*|5.7*|5.8*|5.9*|6.*|7.*|8.*|9.*|10.*)
+        5.4*|5.5*|5.6*|5.7*|5.8*|5.9*|6.*|7.*|8.*|9.*|10.*|11.*|12.*|13.*|14.*)
              { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes, with OpenMP as version ${gxx_version}" >&5
 $as_echo "yes, with OpenMP as version ${gxx_version}" >&6; }
              ## we know this one is good, yay
@@ -2738,63 +2738,6 @@
     esac
 fi
 
-## Check for Apple LLVM
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for macOS" >&5
-$as_echo_n "checking for macOS... " >&6; }
-RSysinfoName=$("${R_HOME}/bin/Rscript" --vanilla -e 'cat(Sys.info()["sysname"])')
-
-if test x"${RSysinfoName}" == x"Darwin"; then
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: found" >&5
-$as_echo "found" >&6; }
-    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for macOS Apple compiler" >&5
-$as_echo_n "checking for macOS Apple compiler... " >&6; }
-
-    apple_compiler=$($CXX --version 2>&1 | grep -i -c -e 'apple llvm')
-
-    if test x"${apple_compiler}" == x"1"; then
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: found" >&5
-$as_echo "found" >&6; }
-        { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: OpenMP unavailable and turned off." >&5
-$as_echo "$as_me: WARNING: OpenMP unavailable and turned off." >&2;}
-        can_use_openmp="no"
-    else
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
-$as_echo "not found" >&6; }
-        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for clang compiler" >&5
-$as_echo_n "checking for clang compiler... " >&6; }
-        clang_compiler=$($CXX --version 2>&1 | grep -i -c -e 'clang ')
-
-        if test x"${clang_compiler}" == x"1"; then
-            { $as_echo "$as_me:${as_lineno-$LINENO}: result: found" >&5
-$as_echo "found" >&6; }
-            { $as_echo "$as_me:${as_lineno-$LINENO}: checking for OpenMP compatible version of clang" >&5
-$as_echo_n "checking for OpenMP compatible version of clang... " >&6; }
-            clang_version=$(${CXX} -v 2>&1 | awk '/^.*clang version/ {print $3}')
-
-            case ${clang_version} in
-                4.*|5.*|6.*|7.*|8.*)
-                    { $as_echo "$as_me:${as_lineno-$LINENO}: result: found and suitable" >&5
-$as_echo "found and suitable" >&6; }
-                    can_use_openmp="yes"
-                ;;
-                *)
-                    { $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
-$as_echo "not found" >&6; }
-                    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: OpenMP unavailable and turned off." >&5
-$as_echo "$as_me: WARNING: OpenMP unavailable and turned off." >&2;}
-                    can_use_openmp="no"
-                ;;
-            esac
-        else
-            { $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
-$as_echo "not found" >&6; }
-            { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: unsupported macOS build detected; if anything breaks, you keep the pieces." >&5
-$as_echo "$as_me: WARNING: unsupported macOS build detected; if anything breaks, you keep the pieces." >&2;}
-        fi
-    fi
-fi
-
 ## Check for suitable LAPACK_LIBS
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking LAPACK_LIBS" >&5
 $as_echo_n "checking LAPACK_LIBS... " >&6; }
@@ -2821,30 +2764,8 @@
     arma_lapack="#define ARMA_CRIPPLED_LAPACK 1"
 fi
 
-## Default the OpenMP flag to the empty string.
-## If and only if OpenMP is found, expand to $(SHLIB_OPENMP_CXXFLAGS)
-openmp_flag=""
-## Set the fallback, by default it is nope
-arma_have_openmp="#define ARMA_DONT_USE_OPENMP 1"
-
-if test x"${can_use_openmp}" == x"yes"; then
-    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for OpenMP" >&5
-$as_echo_n "checking for OpenMP... " >&6; }
-    ## if R has -fopenmp we should be good
-    allldflags=$(${R_HOME}/bin/R CMD config --ldflags)
-    hasOpenMP=$(echo ${allldflags} | grep -- -fopenmp)
-    if test x"${hasOpenMP}" == x""; then
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: missing" >&5
-$as_echo "missing" >&6; }
-        arma_have_openmp="#define ARMA_DONT_USE_OPENMP 1"
-    else
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: found and suitable" >&5
-$as_echo "found and suitable" >&6; }
-        arma_have_openmp="#define ARMA_USE_OPENMP 1"
-        openmp_flag='$(SHLIB_OPENMP_CXXFLAGS)'
-    fi
-fi
-
+arma_have_openmp="#define ARMA_USE_OPENMP 1"
+openmp_flag='$(SHLIB_OPENMP_CXXFLAGS)'
 
 ## now use all these
 ARMA_LAPACK="${arma_lapack}"