diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5452fbe..ee8ebe9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -298,6 +298,56 @@ else()
     message(STATUS "Unknown architecture")
 endif()
 
+#
+# POSIX conformance
+# Section copy-pasted from https://github.com/ggerganov/llama.cpp/blob/8781013ef654270cbead3e0011e33a6d690fb168/CMakeLists.txt#L580C20-L580C20
+#
+
+# clock_gettime came in POSIX.1b (1993)
+# CLOCK_MONOTONIC came in POSIX.1-2001 / SUSv3 as optional
+# posix_memalign came in POSIX.1-2001 / SUSv3
+# M_PI is an XSI extension since POSIX.1-2001 / SUSv3, came in XPG1 (1985)
+add_compile_definitions(_XOPEN_SOURCE=600)
+
+# Somehow in OpenBSD whenever POSIX conformance is specified
+# some string functions rely on locale_t availability,
+# which was introduced in POSIX.1-2008, forcing us to go higher.
+if (CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
+    remove_definitions(-D_XOPEN_SOURCE=600)
+    add_compile_definitions(_XOPEN_SOURCE=700)
+endif()
+
+# Data types, macros and functions related to controlling CPU affinity and
+# some memory allocation are available on Linux through GNU extensions in libc.
+if (CMAKE_SYSTEM_NAME MATCHES "Linux")
+    add_compile_definitions(_GNU_SOURCE)
+endif()
+
+# RLIMIT_MEMLOCK came in BSD, is not specified in POSIX.1,
+# and on macOS its availability depends on enabling Darwin extensions.
+# Similarly on DragonFly, enabling BSD extensions is necessary.
+if (
+    CMAKE_SYSTEM_NAME MATCHES "Darwin" OR
+    CMAKE_SYSTEM_NAME MATCHES "iOS" OR
+    CMAKE_SYSTEM_NAME MATCHES "tvOS" OR
+    CMAKE_SYSTEM_NAME MATCHES "DragonFly"
+)
+    add_compile_definitions(_DARWIN_C_SOURCE)
+endif()
+
+# alloca is a non-standard interface that is not visible on BSDs when
+# POSIX conformance is specified, but not all of them provide a clean way
+# to enable it in such cases.
+if (CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
+    add_compile_definitions(__BSD_VISIBLE)
+endif()
+if (CMAKE_SYSTEM_NAME MATCHES "NetBSD")
+    add_compile_definitions(_NETBSD_SOURCE)
+endif()
+if (CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
+    add_compile_definitions(_BSD_SOURCE)
+endif()
+
 #
 # Build libraries
 #
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 5c4d598..8705d94 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -19,8 +19,7 @@ file(COPY tiny-rwkv-660K-Q5_0.bin DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 file(COPY tiny-rwkv-660K-Q5_1.bin DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 file(COPY expected_logits.bin DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 
-# TODO Restore
-#rwkv_add_test(test_ggml_basics.c)
+rwkv_add_test(test_ggml_basics.c)
 rwkv_add_test(test_quantized_matmul_on_gpu.c)
 rwkv_add_test(test_tiny_rwkv.c)
 rwkv_add_test(test_quantization_format_compatibility.c)