More build fixes.

linux-build-farm/centos-6/x64/Dockerfile

@@ -5,10 +5,13 @@ RUN yum update -y
 RUN yum install -y epel-release
 RUN yum install -y make development-tools rpmdevtools http-parser-devel lz4-devel libnatpmp-devel
 
-RUN yum install -y centos-release-scl
-RUN yum install -y devtoolset-4-gcc-c++
+#RUN yum install -y centos-release-scl
+#RUN yum install -y devtoolset-4-gcc-c++
 
-RUN ln -sf /opt/rh/devtoolset-4/root/usr/bin/gcc /usr/bin/gcc
-RUN ln -sf /opt/rh/devtoolset-4/root/usr/bin/g++ /usr/bin/g++
+RUN yum install -y clang
+RUN yum install -y gcc-c++
+
+#RUN ln -sf /opt/rh/devtoolset-4/root/usr/bin/gcc /usr/bin/gcc
+#RUN ln -sf /opt/rh/devtoolset-4/root/usr/bin/g++ /usr/bin/g++
 
 ADD zt1-src.tar.gz /

linux-build-farm/centos-6/x86/Dockerfile

@@ -17,7 +17,7 @@ RUN yum install -y gcc-c++
 
 ADD zt1-src.tar.gz /
 
-RUN mv /ZeroTierOne/make-linux.mk /ZeroTierOne/make-linux.mk.old
-RUN echo 'CFLAGS=-O3 -fstack-protector' >/ZeroTierOne/make-linux.mk
-RUN echo 'CXXFLAGS=-O3 -fstack-protector' >>/ZeroTierOne/make-linux.mk
-RUN cat /ZeroTierOne/make-linux.mk.old >>/ZeroTierOne/make-linux.mk
+#RUN mv /ZeroTierOne/make-linux.mk /ZeroTierOne/make-linux.mk.old
+#RUN echo 'CFLAGS=-O3 -fstack-protector' >/ZeroTierOne/make-linux.mk
+#RUN echo 'CXXFLAGS=-O3 -fstack-protector' >>/ZeroTierOne/make-linux.mk
+#RUN cat /ZeroTierOne/make-linux.mk.old >>/ZeroTierOne/make-linux.mk

linux-build-farm/centos-7/x64/Dockerfile

@@ -0,0 +1,10 @@
+FROM centos:7
+MAINTAINER Adam Ierymenko <adam.ierymenko@zerotier.com>
+
+RUN yum update -y
+RUN yum install -y epel-release
+RUN yum install -y make development-tools rpmdevtools http-parser-devel lz4-devel libnatpmp-devel
+
+RUN yum install -y clang gcc-c++
+
+ADD zt1-src.tar.gz /

linux-build-farm/centos-7/x86/Dockerfile

@@ -0,0 +1,17 @@
+#FROM zerotier/centos7-32bit
+#MAINTAINER Adam Ierymenko <adam.ierymenko@zerotier.com>
+
+#RUN echo 'i686-redhat-linux' >/etc/rpm/platform
+
+#RUN yum update -y
+#RUN yum install -y make development-tools rpmdevtools http-parser-devel lz4-devel libnatpmp-devel
+
+#RUN yum install -y gcc-c++
+#RUN rpm --install --force https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
+#RUN rpm --install --force ftp://rpmfind.net/linux/centos/6.8/os/i386/Packages/libffi-3.0.5-3.2.el6.i686.rpm
+#RUN yum install -y clang
+
+FROM zerotier/zt1-build-centos-7-x86-base
+MAINTAINER Adam Ierymenko <adam.ierymenko@zerotier.com>
+
+ADD zt1-src.tar.gz /

zerotier-one.spec

@@ -64,7 +64,11 @@ rm -f %{name}-%{version}
 cp -a %{getenv:PWD}/* .
 
 %build
+%if 0%{?rhel} <= 7
 make CFLAGS="`echo %{optflags} | sed s/stack-protector-strong/stack-protector/`" CXXFLAGS="`echo %{optflags} | sed s/stack-protector-strong/stack-protector/`" ZT_USE_MINIUPNPC=1 %{?_smp_mflags} one manpages selftest
+%else
+make CFLAGS="%{optflags}" CXXFLAGS="%{optflags}" ZT_USE_MINIUPNPC=1 %{?_smp_mflags} one manpages selftest
+%endif
 
 %install
 rm -rf $RPM_BUILD_ROOT