diff --git a/subprojects/libsignal-protocol-c.wrap b/subprojects/libsignal-protocol-c.wrap
index 3a628479b..33ecdc29b 100644
--- a/subprojects/libsignal-protocol-c.wrap
+++ b/subprojects/libsignal-protocol-c.wrap
@@ -4,7 +4,7 @@ source_url = https://github.com/WhisperSystems/libsignal-protocol-c/archive/v2.3
 source_filename = libsignal-protocol-c-2.3.3.tar.gz
 source_hash = c22e7690546e24d46210ca92dd808f17c3102e1344cd2f9a370136a96d22319d
 patch_directory = libsignal-protocol-c
-diff_files = libsignal-protocol-c/dllexport.patch
+diff_files = libsignal-protocol-c/dllexport.patch, libsignal-protocol-c/dllexport.patch
 
 [provide]
 dependency_names = libsignal-protocol-c
diff --git a/subprojects/packagefiles/libsignal-protocol-c/src/meson.build b/subprojects/packagefiles/libsignal-protocol-c/src/meson.build
index d696d2c48..48a57f6ac 100644
--- a/subprojects/packagefiles/libsignal-protocol-c/src/meson.build
+++ b/subprojects/packagefiles/libsignal-protocol-c/src/meson.build
@@ -105,7 +105,7 @@ include_directories = include_directories(
     'curve25519/ed25519/nacl_includes',
     'curve25519/ed25519/tests',
 )
-c_args = []
+c_args = ['-DBUILDING_SIGNAL']
 public_c_args = []
 if cc.has_function('SecureZeroMemory', prefix: '#include <Windows.h>')
     c_args += ['-DSECUREZEROMEMORY']
diff --git a/subprojects/packagefiles/libsignal-protocol-c/vla.patch b/subprojects/packagefiles/libsignal-protocol-c/vla.patch
new file mode 100644
index 000000000..9a2ab34ff
--- /dev/null
+++ b/subprojects/packagefiles/libsignal-protocol-c/vla.patch
@@ -0,0 +1,72 @@
+diff --git a/src/curve25519/ed25519/tests/internal_fast_tests.c b/src/curve25519/ed25519/tests/internal_fast_tests.c
+index 6566e25..5e5db58 100644
+--- a/src/curve25519/ed25519/tests/internal_fast_tests.c
++++ b/src/curve25519/ed25519/tests/internal_fast_tests.c
+@@ -27,6 +27,7 @@
+     } \
+   } while (0)
+ 
++#define MSG_LEN 200
+ 
+ int sha512_fast_test(int silent)
+ {
+@@ -293,7 +294,6 @@ int curvesigs_fast_test(int silent)
+     0x0b, 0xd6, 0xc1, 0x97, 0x3f, 0x7d, 0x78, 0x0a, 
+     0xb3, 0x95, 0x18, 0x62, 0x68, 0x03, 0xd7, 0x82,
+   };
+-  const int MSG_LEN  = 200;
+   unsigned char privkey[32];
+   unsigned char pubkey[32];
+   unsigned char signature[64];
+@@ -333,7 +333,6 @@ int xeddsa_fast_test(int silent)
+   0x69, 0xad, 0xa5, 0x76, 0xd6, 0x3d, 0xca, 0xf2, 
+   0xac, 0x32, 0x6c, 0x11, 0xd0, 0xb9, 0x77, 0x02,
+   };
+-  const int MSG_LEN  = 200;
+   unsigned char privkey[32];
+   unsigned char pubkey[32];
+   unsigned char signature[64];
+diff --git a/src/curve25519/ed25519/tests/internal_slow_tests.c b/src/curve25519/ed25519/tests/internal_slow_tests.c
+index 740ddbe..af870e6 100644
+--- a/src/curve25519/ed25519/tests/internal_slow_tests.c
++++ b/src/curve25519/ed25519/tests/internal_slow_tests.c
+@@ -26,6 +26,7 @@
+     } \
+   } while (0)
+ 
++#define MSG_LEN 200
+ 
+ 
+ int curvesigs_slow_test(int silent, int iterations)
+@@ -43,7 +44,6 @@ int curvesigs_slow_test(int silent, int iterations)
+   };
+ 
+   int count;  
+-  const int MSG_LEN  = 200;
+   unsigned char privkey[32];
+   unsigned char pubkey[32];
+   unsigned char signature[64];
+@@ -110,7 +110,6 @@ int xeddsa_slow_test(int silent, int iterations)
+   };
+ 
+   int count;  
+-  const int MSG_LEN  = 200;
+   unsigned char privkey[32];
+   unsigned char pubkey[32];
+   unsigned char signature[96];
+@@ -177,7 +176,6 @@ int xeddsa_to_curvesigs_slow_test(int silent, int iterations)
+   };
+ 
+   int count;  
+-  const int MSG_LEN  = 200;
+   unsigned char privkey[32];
+   unsigned char pubkey[32];
+   unsigned char signature[96];
+@@ -294,7 +292,6 @@ int generalized_xveddsa_slow_test(int silent, int iterations)
+   */
+ 
+   int count;  
+-  const int MSG_LEN  = 200;
+   unsigned char privkey[32];
+   unsigned char pubkey[32];
+   unsigned char signature[96];