diff -aur a/m4/audacity_checklib_libflac.m4 b/m4/audacity_checklib_libflac.m4
--- a/m4/audacity_checklib_libflac.m4
+++ b/m4/audacity_checklib_libflac.m4
@@ -13,16 +13,16 @@
 
    dnl See if FLAC is installed in the system
 
-   PKG_CHECK_MODULES([FLAC], [flac >= 1.3.0 flac++ >= 1.3.0],
+   PKG_CHECK_MODULES([FLAC], [flac >= 1.4.0 flac++ >= 1.4.0],
                      [LIBFLAC_SYSTEM_AVAILABLE="yes"],
                      [LIBFLAC_SYSTEM_AVAILABLE="no"])
 
-   dnl Check for flac < 1.3.0
+   dnl Check for flac < 1.4.0
    if test "$LIBFLAC_SYSTEM_AVAILABLE" = "no"; then
       PKG_CHECK_MODULES([FLAC], [flac flac++],
                         [LIBFLAC_SYSTEM_AVAILABLE="yes"],
                         [LIBFLAC_SYSTEM_AVAILABLE="no"])
-      dnl flac < 1.3.0 adds its own FLAC and FLAC++ subdirectories to the search
+      dnl flac < 1.4.0 adds its own FLAC and FLAC++ subdirectories to the search
       dnl path and ships a assert.h file there. This assert.h overwrites the
       dnl assert.h header from the C standard library. We need to strip /FLAC
       dnl and /FLAC++ from the include paths to make the assert.h from the C