diff --git a/build/cmake/ConfigureChecks.cmake b/build/cmake/ConfigureChecks.cmake
index e4793d4..6b9c6a3 100644
--- a/build/cmake/ConfigureChecks.cmake
+++ b/build/cmake/ConfigureChecks.cmake
@@ -34,6 +34,7 @@
 check_include_file(inttypes.h HAVE_INTTYPES_H)
 check_include_file(netdb.h HAVE_NETDB_H)
 check_include_file(netinet/in.h HAVE_NETINET_IN_H)
+check_include_file(signal.h HAVE_SIGNAL_H)
 check_include_file(stdint.h HAVE_STDINT_H)
 check_include_file(unistd.h HAVE_UNISTD_H)
 check_include_file(pthread.h HAVE_PTHREAD_H)
diff --git a/build/cmake/config.h.in b/build/cmake/config.h.in
index 21561b2..c5d4d30 100644
--- a/build/cmake/config.h.in
+++ b/build/cmake/config.h.in
@@ -91,6 +91,9 @@
 /* Define to 1 if you have the <netinet/in.h> header file. */
 #cmakedefine HAVE_NETINET_IN_H 1
 
+/* Define to 1 if you have the <signal.h> header file. */
+#cmakedefine HAVE_SIGNAL_H 1
+
 /* Define to 1 if you have the <stdint.h> header file. */
 #cmakedefine HAVE_STDINT_H 1
 
diff --git a/build/docker/scripts/autotools.sh b/build/docker/scripts/autotools.sh
index 67e4f2d..8388f72 100755
--- a/build/docker/scripts/autotools.sh
+++ b/build/docker/scripts/autotools.sh
@@ -1,10 +1,6 @@
 #!/bin/sh
 set -ev
 
-# haxe hxcpp > 3.4.188 will enable c++11 by default, and break the
-#      build when compiling C files with clang++ by adding -std=c++11
-export HXCPP_NO_CPP11=1
-
 ./bootstrap.sh
 ./configure $*
 make check -j3