diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1e3088c6b..603239ac4 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -503,6 +503,7 @@ target_compile_options(SRB2SDL2 PRIVATE
 	$<$<AND:$<COMPILE_LANGUAGE:C>,$<OR:$<C_COMPILER_ID:AppleClang>,$<C_COMPILER_ID:Clang>>>:
 		-Wall
 		-Wextra
+		-Wno-error=date-time
 		-Wno-absolute-value
 		-Wno-trigraphs
 		-Wno-error=non-literal-null-conversion
@@ -515,6 +516,7 @@ target_compile_options(SRB2SDL2 PRIVATE
 	# C++, GNU, Clang and Apple Clang
 	$<$<AND:$<COMPILE_LANGUAGE:CXX>,$<OR:$<C_COMPILER_ID:GNU>,$<C_COMPILER_ID:AppleClang>,$<C_COMPILER_ID:Clang>>>:
 		-Wall
+		-Wno-error=date-time
 		-Wno-unused-function
 		-Wno-unused-but-set-variable
 		-Wno-unused-private-field
diff --git a/src/acs/ACSVM/ACSVM/String.hpp b/src/acs/ACSVM/ACSVM/String.hpp
index 7c46e4f92..363addd4b 100644
--- a/src/acs/ACSVM/ACSVM/String.hpp
+++ b/src/acs/ACSVM/ACSVM/String.hpp
@@ -19,6 +19,7 @@
 #include <cstring>
 #include <functional>
 #include <memory>
+#include <istream>
 
 
 //----------------------------------------------------------------------------|
diff --git a/src/cxxutil.hpp b/src/cxxutil.hpp
index b8b211bf1..4ee931da6 100644
--- a/src/cxxutil.hpp
+++ b/src/cxxutil.hpp
@@ -2,6 +2,7 @@
 #define __SRB2_CXXUTIL_HPP__
 
 #include <cstdlib>
+#include <cmath>
 #include <type_traits>
 #include <utility>
 
diff --git a/src/d_net.c b/src/d_net.c
index 5ec023ef4..45b449467 100644
--- a/src/d_net.c
+++ b/src/d_net.c
@@ -1083,7 +1083,8 @@ boolean HSendPacket(INT32 node, boolean reliable, UINT8 acknum, size_t packetlen
 	else
 		netbuffer->ack = acknum;
 
-	netbuffer->packetindex = nodes[doomcom->remotenode].sendnum++;
+	if (node < MAXNETNODES)
+		netbuffer->packetindex = nodes[doomcom->remotenode].sendnum++;
 	netbuffer->checksum = NetbufferChecksum();
 	sendbytes += packetheaderlength + doomcom->datalength; // For stat
 
diff --git a/thirdparty/tcbrindle_span/include/tcb/span.hpp b/thirdparty/tcbrindle_span/include/tcb/span.hpp
index fdc3a988a..63ad0b43d 100644
--- a/thirdparty/tcbrindle_span/include/tcb/span.hpp
+++ b/thirdparty/tcbrindle_span/include/tcb/span.hpp
@@ -16,6 +16,7 @@ http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/n4820.pdf
 #include <cstddef>
 #include <cstdint>
 #include <type_traits>
+#include <exception>
 
 #ifndef TCB_SPAN_NO_EXCEPTIONS
 // Attempt to discover whether we're being compiled with exception support
diff --git a/toolchain/LinuxZig.cmake b/toolchain/LinuxZig.cmake
new file mode 100644
index 000000000..28de1b493
--- /dev/null
+++ b/toolchain/LinuxZig.cmake
@@ -0,0 +1,8 @@
+# which compilers to use for C and C++
+set(CMAKE_C_COMPILER   zig cc)
+set(CMAKE_CXX_COMPILER zig c++)
+set(CMAKE_C_COMPILER_TARGET ${TARGET})
+set(CMAKE_CXX_COMPILER_TARGET ${TARGET})
+
+set(CMAKE_C_LINKER_DEPFILE_SUPPORTED FALSE)
+set(CMAKE_CXX_LINKER_DEPFILE_SUPPORTED FALSE)