diff --git a/src/coreclr/pal/src/config.h.in b/src/coreclr/pal/src/config.h.in
index c68421302e1153..75507804d23a00 100644
--- a/src/coreclr/pal/src/config.h.in
+++ b/src/coreclr/pal/src/config.h.in
@@ -62,7 +62,7 @@
 #cmakedefine01 HAVE_SEMAPHORE_H
 #cmakedefine01 HAS_SYSV_SEMAPHORES
 #cmakedefine01 HAS_PTHREAD_MUTEXES
-#cmakedefine01 HAVE_TTRACE
+#cmakedefine HAVE_TTRACE
 #cmakedefine01 HAVE_PIPE2
 #cmakedefine01 HAVE_SCHED_GETAFFINITY
 #cmakedefine01 HAVE_SCHED_SETAFFINITY
diff --git a/src/coreclr/pal/src/debug/debug.cpp b/src/coreclr/pal/src/debug/debug.cpp
index 3e20cb7c1c1534..f0a504452c59bb 100644
--- a/src/coreclr/pal/src/debug/debug.cpp
+++ b/src/coreclr/pal/src/debug/debug.cpp
@@ -42,9 +42,9 @@ SET_DEFAULT_DEBUG_CHANNEL(DEBUG); // some headers have code with asserts, so do
 #include <unistd.h>
 #if HAVE_PROCFS_CTL
 #include <unistd.h>
-#elif HAVE_TTRACE // HAVE_PROCFS_CTL
+#elif defined(HAVE_TTRACE) // HAVE_PROCFS_CTL
 #include <sys/ttrace.h>
-#else // HAVE_TTRACE
+#else // defined(HAVE_TTRACE)
 #include <sys/ptrace.h>
 #endif  // HAVE_PROCFS_CTL
 #if HAVE_VM_READ
diff --git a/src/native/eventpipe/ds-ipc-pal-socket.c b/src/native/eventpipe/ds-ipc-pal-socket.c
index f5831a6e21c72f..20e3f11c52383e 100644
--- a/src/native/eventpipe/ds-ipc-pal-socket.c
+++ b/src/native/eventpipe/ds-ipc-pal-socket.c
@@ -530,14 +530,14 @@ ipc_socket_accept (
 	ds_ipc_socket_t client_socket;
 	DS_ENTER_BLOCKING_PAL_SECTION;
 	do {
-#if defined(HAVE_ACCEPT4) && defined(SOCK_CLOEXEC)
+#if HAVE_ACCEPT4 && defined(SOCK_CLOEXEC)
     	client_socket = accept4 (s, address, address_len, SOCK_CLOEXEC);
 #else
     	client_socket = accept (s, address, address_len);
 #endif
 	} while (ipc_retry_syscall (client_socket));
 
-#if !defined(HAVE_ACCEPT4) || !defined(SOCK_CLOEXEC)
+#if !HAVE_ACCEPT4 || !defined(SOCK_CLOEXEC)
 #if defined(FD_CLOEXEC)
 		if (client_socket != -1)
 		{
diff --git a/src/native/external/libunwind-version.txt b/src/native/external/libunwind-version.txt
index 0953763c6bc1a7..4b47acff5ed4f0 100644
--- a/src/native/external/libunwind-version.txt
+++ b/src/native/external/libunwind-version.txt
@@ -4,6 +4,7 @@ https://github.com/libunwind/libunwind/commit/b3ca1b59a795a617877c01fe5d299ab7a0
 Reapply changes from https://github.com/dotnet/runtime/commit/1b5719c2e3dde393531eaeb5b5cde05dabeef5b8
 Apply https://github.com/libunwind/libunwind/pull/317
 Apply https://github.com/libunwind/libunwind/pull/333
+Apply https://github.com/libunwind/libunwind/pull/342
 
 For LoongArch64:
 Apply https://github.com/libunwind/libunwind/pull/316 and https://github.com/libunwind/libunwind/pull/322
diff --git a/src/native/external/libunwind/src/ptrace/_UPT_access_fpreg.c b/src/native/external/libunwind/src/ptrace/_UPT_access_fpreg.c
index bae343833932e5..178a97c0d88f84 100644
--- a/src/native/external/libunwind/src/ptrace/_UPT_access_fpreg.c
+++ b/src/native/external/libunwind/src/ptrace/_UPT_access_fpreg.c
@@ -26,7 +26,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 
 #include "_UPT_internal.h"
 
-#if HAVE_DECL_PTRACE_POKEUSER || HAVE_TTRACE
+#if HAVE_DECL_PTRACE_POKEUSER || defined(HAVE_TTRACE)
 int
 _UPT_access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val,
                    int write, void *arg)
diff --git a/src/native/external/libunwind/src/ptrace/_UPT_access_mem.c b/src/native/external/libunwind/src/ptrace/_UPT_access_mem.c
index 79bde25dffc056..5d6511c56c6c25 100644
--- a/src/native/external/libunwind/src/ptrace/_UPT_access_mem.c
+++ b/src/native/external/libunwind/src/ptrace/_UPT_access_mem.c
@@ -26,7 +26,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 
 #include "_UPT_internal.h"
 
-#if HAVE_DECL_PTRACE_POKEDATA || HAVE_TTRACE
+#if HAVE_DECL_PTRACE_POKEDATA || defined(HAVE_TTRACE)
 int
 _UPT_access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val,
                  int write, void *arg)
diff --git a/src/native/external/libunwind/src/ptrace/_UPT_access_reg.c b/src/native/external/libunwind/src/ptrace/_UPT_access_reg.c
index 0e247053f13bcf..033d3aae7f4eaa 100644
--- a/src/native/external/libunwind/src/ptrace/_UPT_access_reg.c
+++ b/src/native/external/libunwind/src/ptrace/_UPT_access_reg.c
@@ -77,7 +77,7 @@ _UPT_access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val,
   Debug (1, "bad register %s [%u] (error: %s)\n", unw_regname(reg), reg, strerror (errno));
   return -UNW_EBADREG;
 }
-#elif HAVE_DECL_PTRACE_POKEUSER || HAVE_TTRACE
+#elif HAVE_DECL_PTRACE_POKEUSER || defined(HAVE_TTRACE)
 int
 _UPT_access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val,
                  int write, void *arg)
diff --git a/src/native/libs/System.Native/pal_io.c b/src/native/libs/System.Native/pal_io.c
index 5061e4b114cd3b..e05f57a5fec17a 100644
--- a/src/native/libs/System.Native/pal_io.c
+++ b/src/native/libs/System.Native/pal_io.c
@@ -211,7 +211,7 @@ static void ConvertFileStatus(const struct stat_* src, FileStatus* dst)
     dst->BirthTimeNsec = 0;
 #endif
 
-#if defined(HAVE_STAT_FLAGS) && defined(UF_HIDDEN)
+#if HAVE_STAT_FLAGS && defined(UF_HIDDEN)
     dst->UserFlags = ((src->st_flags & UF_HIDDEN) == UF_HIDDEN) ? PAL_UF_HIDDEN : 0;
 #else
     dst->UserFlags = 0;
@@ -1607,7 +1607,7 @@ int32_t SystemNative_LockFileRegion(intptr_t fd, int64_t offset, int64_t length,
     struct flock lockArgs;
 #endif
 
-#if defined(TARGET_ANDROID) && defined(HAVE_FLOCK64)
+#if defined(TARGET_ANDROID) && HAVE_FLOCK64
     // On Android, fcntl is always implemented by fcntl64 but before https://github.com/aosp-mirror/platform_bionic/commit/09e77f35ab8d291bf88302bb9673aaa518c6bcb0
     // there was no remapping of F_SETLK to F_SETLK64 when _FILE_OFFSET_BITS=64 (which we set in eng/native/configurecompiler.cmake) so we need to always pass F_SETLK64
     int command = F_SETLK64;
@@ -1640,7 +1640,7 @@ int32_t SystemNative_LChflags(const char* path, uint32_t flags)
 
 int32_t SystemNative_LChflagsCanSetHiddenFlag(void)
 {
-#if defined(HAVE_LCHFLAGS)
+#if HAVE_LCHFLAGS
     return SystemNative_CanGetHiddenFlag();
 #else
     return false;
@@ -1649,7 +1649,7 @@ int32_t SystemNative_LChflagsCanSetHiddenFlag(void)
 
 int32_t SystemNative_CanGetHiddenFlag(void)
 {
-#if defined(UF_HIDDEN) && defined(HAVE_STAT_FLAGS)
+#if HAVE_STAT_FLAGS && defined(UF_HIDDEN)
     return true;
 #else
     return false;
diff --git a/src/native/libs/System.Native/pal_mount.c b/src/native/libs/System.Native/pal_mount.c
index 8612775cc9c53f..bf8c49a6c37118 100644
--- a/src/native/libs/System.Native/pal_mount.c
+++ b/src/native/libs/System.Native/pal_mount.c
@@ -33,7 +33,7 @@ int32_t SystemNative_GetAllMountPoints(MountPointFound onFound)
 {
 #if HAVE_MNTINFO
     // getmntinfo returns pointers to OS-internal structs, so we don't need to worry about free'ing the object
-#if defined(HAVE_STATFS)
+#if HAVE_STATFS
     struct statfs* mounts = NULL;
 #else
     struct statvfs* mounts = NULL;
diff --git a/src/native/libs/System.Native/pal_networking.c b/src/native/libs/System.Native/pal_networking.c
index 3236fe26acfeba..a4deeeb8d20f49 100644
--- a/src/native/libs/System.Native/pal_networking.c
+++ b/src/native/libs/System.Native/pal_networking.c
@@ -1501,7 +1501,7 @@ int32_t SystemNative_Accept(intptr_t socket, uint8_t* socketAddress, int32_t* so
 
     socklen_t addrLen = (socklen_t)*socketAddressLen;
     int accepted;
-#if defined(HAVE_ACCEPT4) && defined(SOCK_CLOEXEC)
+#if HAVE_ACCEPT4 && defined(SOCK_CLOEXEC)
     while ((accepted = accept4(fd, (struct sockaddr*)socketAddress, &addrLen, SOCK_CLOEXEC)) < 0 && errno == EINTR);
 #else
     while ((accepted = accept(fd, (struct sockaddr*)socketAddress, &addrLen)) < 0 && errno == EINTR);