diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2f3941d..ab8c322 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,8 @@ find_package(Git)
 find_package(Sqlite3)
 
 include(TestBigEndian)
-include(CheckSymbolExists) 
+include(CheckSymbolExists)
+include(CheckFunctionExists)
 include(CheckIncludeFile)
 include(CheckTypeSize)
 
@@ -69,9 +70,19 @@ check_include_file(sys/types.h HAVE_SYS_TYPES_H)
 if (HAVE_SYS_TYPES_H)
 set (CMAKE_EXTRA_INCLUDE_FILES ${CMAKE_EXTRA_INCLUDE_FILES} "sys/types.h")
 endif()
-check_type_size( ssize_t SSIZE_T )
+
+check_include_file(sys/uio.h HAVE_SYS_UIO_H)
+if (HAVE_SYS_UIO_H)
+set (CMAKE_EXTRA_INCLUDE_FILES ${CMAKE_EXTRA_INCLUDE_FILES} "sys/uio.h")
+endif()
+
+check_type_size(ssize_t SSIZE_T)
 check_symbol_exists(memmem string.h HAVE_MEMMEM)
 check_symbol_exists(strndup string.h HAVE_STRNDUP)
+check_function_exists(writev HAVE_FUNC_WRITEV)
+check_function_exists(pwritev HAVE_FUNC_PWRITEV)
+check_function_exists(readv HAVE_FUNC_WRITEV)
+check_function_exists(preadv HAVE_FUNC_PWRITEV)
 
 include_directories("${PROJECT_SOURCE_DIR}")
 include_directories(${SQLITE3_INCLUDE_DIRS})
diff --git a/src/system.h.in b/src/system.h.in
index dce1892..e9e9c42 100644
--- a/src/system.h.in
+++ b/src/system.h.in
@@ -88,6 +88,11 @@
 #cmakedefine HAVE_STRNDUP
 #cmakedefine HAVE_MEMMEM
 
+#cmakedefine HAVE_SYS_UIO_H
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/uio.h>
+#endif
+
 /* printf support for size_t and uint64_t */
 #if defined(WIN32)
 #define PRINTF_SIZE_T "%Iu"