diff --git a/configure.ac b/configure.ac
index 6104d0b3b..e4f53b20b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -137,21 +137,6 @@ AC_ARG_ENABLE([longtests],
 AC_SUBST(CFG_WITH_LONGTESTS)
 AC_MSG_RESULT($CFG_WITH_LONGTESTS)
 
-# Disable version check
-AC_MSG_CHECKING(whether to disable version check)
-AC_ARG_ENABLE([version-check],
-              [AS_HELP_STRING([--disable-version-check],
-                              [disable minimum compile version check.
-                              use only when instructed by developers])],
-              [case "${enableval}" in
-                yes) CFG_VERSION_CHECK=yes ;;
-                no)  CFG_VERSION_CHECK=no ;;
-                *)   AC_MSG_ERROR([bad value ${enableval} for --disable-version-check]) ;;
-               esac],
-              CFG_VERSION_CHECK=yes)
-AC_SUBST(CFG_VERSION_CHECK)
-AC_MSG_RESULT($CFG_VERSION_CHECK)
-
 AC_CHECK_PROG(HAVE_Z3,z3,yes)
 AC_CHECK_PROG(HAVE_CVC5,cvc5,yes)
 AC_CHECK_PROG(HAVE_CVC4,cvc4,yes)
@@ -348,7 +333,6 @@ AC_DEFUN([_MY_CXX_CHECK_CORO_SET],
       if test "$_my_result" = "yes" ; then
         $1="$2"
         AC_DEFINE([HAVE_COROUTINES],[1],[Defined if coroutines are supported by $CXX])
-        CFG_HAVE_COROUTINES=yes
       fi
     fi
   ])
@@ -417,12 +401,12 @@ AC_SUBST(CFG_CXXFLAGS_PROFILE)
 
 # Flag to select newest language standard supported
 # Macros work such that first option that passes is the one we take
-# Beware using flags that are not required, as can break packaged SystemC
-# c++20 is the newest that Verilator is regularly tested to support
+# Currently enable c++17/c++14 due to packaged SystemC dependency
+# c++17 is the newest that Verilator is regularly tested to support
 # c++14 is the oldest that Verilator supports
 # gnu is required for Cygwin to compile verilated.h successfully
-_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++20)
-_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++20)
+#_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++20)
+#_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++20)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++17)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++17)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++14)
@@ -575,7 +559,7 @@ AC_DEFUN([_MY_CXX_CHECK_CXX_VER],
     # Set $_my_result
     AC_LINK_IFELSE(
      [AC_LANG_PROGRAM([#include <thread>
-#if (__cplusplus < 202002L)
+#if (__cplusplus < 201402L)
 # error "Too old"
 #endif
     ], [[ ]])],
@@ -591,13 +575,13 @@ AC_DEFUN([_MY_CXX_CHECK_CXX_VER],
 # Add $CFG_CXXFLAGS_STD only if can't compile correctly otherwise,
 # as adding std= when not needed can cause errors with the C++ std library.
 CFG_CXXFLAGS_STD=$CFG_CXXFLAGS_STD_NEWEST
-AC_MSG_CHECKING(whether $CXX supports C++20)
+AC_MSG_CHECKING(whether $CXX supports C++14)
 _MY_CXX_CHECK_CXX_VER()
 AC_MSG_RESULT($_my_result)
 if test "$_my_result" = "no" ; then
    CXXFLAGS="$CXXFLAGS $CFG_CXXFLAGS_STD"
    CFG_CXX_FLAGS_CMAKE="$CFG_CXX_FLAGS_CMAKE $CFG_CXXFLAGS_STD"
-   AC_MSG_CHECKING(whether $CXX supports C++20 with $CFG_CXXFLAGS_STD)
+   AC_MSG_CHECKING(whether $CXX supports C++14 with $CFG_CXXFLAGS_STD)
    _MY_CXX_CHECK_CXX_VER()
    AC_MSG_RESULT($_my_result)
 else
@@ -605,19 +589,12 @@ else
    # make sure we use the same std flag while compiling verilator and verilated design
    CFG_CXXFLAGS_STD=""
 fi
-if test "$CFG_VERSION_CHECK" != "no" ; then
-  if test "$_my_result" = "no" ; then
-     AC_MSG_NOTICE([[]])
-     AC_MSG_ERROR([[the $CXX compiler appears to not support C++20.
+if test "$_my_result" = "no" ; then
+   AC_MSG_NOTICE([[]])
+   AC_MSG_ERROR([[the $CXX compiler appears to not support C++14.
 
-Verilator requires a C++20 or newer compiler.]])
-  fi
-  if test "$CFG_HAVE_COROUTINES" != "yes" ; then
-     AC_MSG_NOTICE([[]])
-     AC_MSG_ERROR([[the $CXX compiler appears to not support coroutines.
+Verilator requires a C++14 or newer compiler.]])
 
-Verilator requires a C++20 or newer compiler.]])
-  fi
 fi
 AC_SUBST(CFG_CXXFLAGS_STD)