diff -Naur a/configure.ac b/configure.ac
--- a/configure.ac	2021-03-27 18:25:24.000000000 +0000
+++ b/configure.ac	2021-03-30 01:34:01.993467424 +0000
@@ -65,7 +65,7 @@
 # --enable-benchmarks
 AC_ARG_ENABLE([benchmarks], [AS_HELP_STRING([--enable-benchmarks],
     [build benchmarks])])
-AM_CONDITIONAL([WITH_BENCHMARKS], [test "x$enable_benchmarks" == "xyes"])
+AM_CONDITIONAL([WITH_BENCHMARKS], [test "x$enable_benchmarks" = "xyes"])
 AM_COND_IF([WITH_BENCHMARKS], [
     AC_LANG_PUSH([C++])
     AC_CHECK_HEADERS([benchmark/benchmark.h], [],
@@ -79,7 +79,7 @@
     [AS_HELP_STRING([--enable-benchmarks-regenerate],
     [regenerate C code for benchmarks])])
 AM_CONDITIONAL([REGEN_BENCHMARKS],
-    [test "x$enable_benchmarks_regenerate" == "xyes"])
+    [test "x$enable_benchmarks_regenerate" = "xyes"])
 
 
 # checks for programs