diff --git a/DESCRIPTION b/DESCRIPTION
index ab4606a..012a5e0 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: apcf
 Title: Adapted Pair Correlation Function
-Version: 0.3.0
+Version: 0.3.0.900
 Authors@R:
   person(given="Robert", family="Nuske", role=c("aut", "cre"),
          email="robert.nuske@mailbox.org", 
@@ -20,7 +20,7 @@ Depends: R (>= 3.3.0)
 Imports: Rcpp (>= 0.12), wk (>= 0.6.0)
 Suggests: knitr, rmarkdown
 LinkingTo: Rcpp
-SystemRequirements: C++11, GEOS (>= 3.4.0)
+SystemRequirements: GEOS (>= 3.4.0)
 VignetteBuilder: knitr
 LazyData: true
 Roxygen: list(markdown=TRUE)
diff --git a/NEWS.md b/NEWS.md
index 9f38465..8801758 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,6 @@
+# apcf 0.3.1
+* dropped C++11 as a system requirement
+
 # apcf 0.3.0
 * switched to R's random number generator in C++ code
 * fixed CRANs M1mac vsnprintf() warning
diff --git a/configure b/configure
index 7ece6d2..b367801 100755
--- a/configure
+++ b/configure
@@ -2005,25 +2005,17 @@ RVER_MINOR=`echo ${RVER} | cut  -f2 -d"."`
 RVER_PATCH=`echo ${RVER} | cut  -f3 -d"."`
 
 if test $RVER_MAJOR = "development"; then
-    CXX11=`"${RBIN}" CMD config CXX11`
-    CXX11STD=`"${RBIN}" CMD config CXX11STD`
+    CXX=`"${RBIN}" CMD config CXX`
 else
     if test $RVER_MAJOR -lt 3 -o $RVER_MAJOR -eq 3 -a $RVER_MINOR -lt 3; then
         as_fn_error $? "apcf is not compatible with R versions before 3.3.0" "$LINENO" 5
     else
-        if test $RVER_MAJOR -eq 3 -a $RVER_MINOR -eq 3; then
-            CXX11=`"${RBIN}" CMD config CXX1X`
-            CXX11STD=`"${RBIN}" CMD config CXX1XSTD`
-        else
-            CXX11=`"${RBIN}" CMD config CXX11`
-            CXX11STD=`"${RBIN}" CMD config CXX11STD`
-        fi
+        CXX=`"${RBIN}" CMD config CXX`
     fi
 fi
 
 # pick all flags for testing from R
 : ${CC=`"${RBIN}" CMD config CC`}
-: ${CXX=${CXX11} ${CXX11STD}}
 : ${CFLAGS=`"${RBIN}" CMD config CFLAGS`}
 : ${CPPFLAGS=`"${RBIN}" CMD config CPPFLAGS`}
 : ${CXXFLAGS=`"${RBIN}" CMD config CXXFLAGS`}
diff --git a/configure.ac b/configure.ac
index 4a5dd83..30f2fe2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,25 +24,17 @@ RVER_MINOR=`echo ${RVER} | cut  -f2 -d"."`
 RVER_PATCH=`echo ${RVER} | cut  -f3 -d"."`
 
 if test [$RVER_MAJOR = "development"]; then
-    CXX11=`"${RBIN}" CMD config CXX11`
-    CXX11STD=`"${RBIN}" CMD config CXX11STD`
+    CXX=`"${RBIN}" CMD config CXX`
 else
     if test [$RVER_MAJOR -lt 3] -o [$RVER_MAJOR -eq 3 -a $RVER_MINOR -lt 3]; then
         AC_MSG_ERROR([apcf is not compatible with R versions before 3.3.0])
     else
-        if test [$RVER_MAJOR -eq 3 -a $RVER_MINOR -eq 3]; then
-            CXX11=`"${RBIN}" CMD config CXX1X`
-            CXX11STD=`"${RBIN}" CMD config CXX1XSTD`
-        else
-            CXX11=`"${RBIN}" CMD config CXX11`
-            CXX11STD=`"${RBIN}" CMD config CXX11STD`
-        fi
+        CXX=`"${RBIN}" CMD config CXX`
     fi
 fi
 
 # pick all flags for testing from R
 : ${CC=`"${RBIN}" CMD config CC`}
-: ${CXX=${CXX11} ${CXX11STD}}
 : ${CFLAGS=`"${RBIN}" CMD config CFLAGS`}
 : ${CPPFLAGS=`"${RBIN}" CMD config CPPFLAGS`}
 : ${CXXFLAGS=`"${RBIN}" CMD config CXXFLAGS`}
diff --git a/src/Makevars.in b/src/Makevars.in
index 1107987..d4e1c72 100644
--- a/src/Makevars.in
+++ b/src/Makevars.in
@@ -1,3 +1,3 @@
 PKG_CPPFLAGS=@PKG_CPPFLAGS@
 PKG_LIBS=@PKG_LIBS@
-CXX_STD=CXX11
+CXX_STD=CXX
diff --git a/src/Makevars.win b/src/Makevars.win
index 62eedfd..2457058 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -12,7 +12,7 @@ PKG_LIBS = \
 
 all: clean winlibs
 
-CXX_STD = CXX11
+CXX_STD = CXX
 
 winlibs:
 	mkdir -p ../inst