diff --git a/configure b/configure
index 78f8eacd..c9664fd2 100755
--- a/configure
+++ b/configure
@@ -7067,9 +7067,9 @@ $as_echo "$as_me: error: PSBLAS patchlevel \"$pac_cv_psblas_patchlevel\"." >&2;}
    { (exit 1); exit 1; }; }
 fi
 if (( $pac_cv_psblas_major < 3 )) ||
-   (  (( $pac_cv_psblas_major == 3 )) && (( $pac_cv_psblas_minor < 5 ))) ; then
-  { { $as_echo "$as_me:$LINENO: error: I need at least PSBLAS version 3.5." >&5
-$as_echo "$as_me: error: I need at least PSBLAS version 3.5." >&2;}
+   (  (( $pac_cv_psblas_major == 3 )) && (( $pac_cv_psblas_minor < 6 ))) ; then
+  { { $as_echo "$as_me:$LINENO: error: I need at least PSBLAS version 3.6." >&5
+$as_echo "$as_me: error: I need at least PSBLAS version 3.6." >&2;}
    { (exit 1); exit 1; }; }
 else
   { $as_echo "$as_me:$LINENO: Am configuring with PSBLAS version $pac_cv_psblas_major.$pac_cv_psblas_minor.$pac_cv_psblas_patchlevel." >&5
diff --git a/configure.ac b/configure.ac
index 2d13e5df..fac867a3 100755
--- a/configure.ac
+++ b/configure.ac
@@ -490,8 +490,8 @@ if test "x$pac_cv_psblas_patchlevel" == "xunknown"; then
    AC_MSG_ERROR([PSBLAS patchlevel "$pac_cv_psblas_patchlevel".])
 fi
 if (( $pac_cv_psblas_major < 3 )) ||
-   (  (( $pac_cv_psblas_major == 3 )) && (( $pac_cv_psblas_minor < 5 ))) ; then
-  AC_MSG_ERROR([I need at least PSBLAS version 3.5.]) 
+   (  (( $pac_cv_psblas_major == 3 )) && (( $pac_cv_psblas_minor < 6 ))) ; then
+  AC_MSG_ERROR([I need at least PSBLAS version 3.6.]) 
 else
   AC_MSG_NOTICE([Am configuring with PSBLAS version $pac_cv_psblas_major.$pac_cv_psblas_minor.$pac_cv_psblas_patchlevel.])
 fi