Added work around for old volk versions

core/src/dsp/math.h

@@ -30,7 +30,11 @@ namespace dsp {
             }
 
             if constexpr (std::is_same_v<T, complex_t> || std::is_same_v<T, stereo_t>) {
+#ifdef USE_OLD_VOLK_ADD
+                volk_32f_x2_add_32f((float*)out.writeBuf, (float*)_a->readBuf, (float*)_b->readBuf, a_count * 2);
+#else
                 volk_32fc_x2_add_32fc((lv_32fc_t*)out.writeBuf, (lv_32fc_t*)_a->readBuf, (lv_32fc_t*)_b->readBuf, a_count);
+#endif
             }
             else {
                 volk_32f_x2_add_32f(out.writeBuf, _a->readBuf, _b->readBuf, a_count);

docker_builds/ubuntu_bionic/do_build.sh

@@ -15,7 +15,7 @@ cd SDRPlusPlus
 mkdir build
 cd build
 cmake ..
-make -j2
+make CXX_FLAGS=-DUSE_OLD_VOLK_ADD=1 -j2
 
 cd ..
 sh make_debian_package.sh ./build