diff --git a/.github/actions/spelling/expect.txt b/.github/actions/spelling/expect.txt
index b799ec73..cff28eaa 100644
--- a/.github/actions/spelling/expect.txt
+++ b/.github/actions/spelling/expect.txt
@@ -1623,6 +1623,7 @@ typename
 ubsan
 ubuntu
 ucf
+UCLIBC
 UCRT
 udelay
 ue
diff --git a/src/options.h b/src/options.h
index a69128c2..c7ee36a4 100644
--- a/src/options.h
+++ b/src/options.h
@@ -165,7 +165,7 @@
 /** Advanced: Using sendfile() syscall (autodetection by default). */
 #ifndef MDBX_USE_SENDFILE
 #if ((defined(__linux__) || defined(__gnu_linux__)) &&                         \
-     __GLIBC_PREREQ(2, 3)) ||                                                  \
+     !defined(__ANDROID_API__)) ||                                             \
     (defined(__ANDROID_API__) && __ANDROID_API__ >= 21)
 #define MDBX_USE_SENDFILE 1
 #else
@@ -184,8 +184,8 @@
 
 /** Advanced: Using sync_file_range() syscall (autodetection by default). */
 #ifndef MDBX_USE_SYNCFILERANGE
-#if ((defined(__linux__) || defined(__gnu_linux__)) && __GLIBC_PREREQ(2, 6) && \
-     defined(_GNU_SOURCE)) ||                                                  \
+#if ((defined(__linux__) || defined(__gnu_linux__)) &&                         \
+     defined(SYNC_FILE_RANGE_WRITE) && !defined(__ANDROID_API__)) ||           \
     (defined(__ANDROID_API__) && __ANDROID_API__ >= 26)
 #define MDBX_USE_SYNCFILERANGE 1
 #else
diff --git a/src/osal.c b/src/osal.c
index 21a0230f..04ea5140 100644
--- a/src/osal.c
+++ b/src/osal.c
@@ -134,7 +134,18 @@ typedef struct _FILE_PROVIDER_EXTERNAL_INFO_V1 {
 
 /*----------------------------------------------------------------------------*/
 
-#if _POSIX_C_SOURCE > 200212 &&                                                \
+#if defined(__UCLIBC__)
+__extern_C void __assert(const char *, const char *, unsigned int, const char *)
+#ifdef __THROW
+    __THROW
+#else
+    __nothrow
+#endif /* __THROW */
+    __noreturn;
+#define __assert_fail(assertion, file, line, function)                         \
+  __assert(assertion, file, line, function)
+
+#elif _POSIX_C_SOURCE > 200212 &&                                              \
     /* workaround for avoid musl libc wrong prototype */ (                     \
         defined(__GLIBC__) || defined(__GNU_LIBRARY__))
 /* Prototype should match libc runtime. ISO POSIX (2003) & LSB 1.x-3.x */