diff --git a/flaim/configure.ac b/flaim/configure.ac
index 3048f25..155d3da 100644
--- a/flaim/configure.ac
+++ b/flaim/configure.ac
@@ -115,6 +115,7 @@ fi
 
 # Configure global pre-processor definitions.
 AC_DEFINE([_REENTRANT], [], [Define for reentrant code])
+AC_SYS_LARGEFILE
 # AC_DEFINE([_LARGEFILE64_SOURCE], [], [Define for 64-bit data files])
 # AC_DEFINE([_LARGEFILE_SOURCE], [], [Define for 64-bit data files])
 
diff --git a/ftk/configure.ac b/ftk/configure.ac
index 6258009..c39e5f8 100644
--- a/ftk/configure.ac
+++ b/ftk/configure.ac
@@ -103,6 +103,7 @@ fi
 
 # Configure global pre-processor definitions.
 AC_DEFINE([_REENTRANT], [], [Define for reentrant code])
+AC_SYS_LARGEFILE
 # AC_DEFINE([_LARGEFILE64_SOURCE], [], [Define for 64-bit data files])
 # AC_DEFINE([_LARGEFILE_SOURCE], [], [Define for 64-bit data files])
 
diff --git a/sql/configure.ac b/sql/configure.ac
index 8fd7822..64cd46f 100644
--- a/sql/configure.ac
+++ b/sql/configure.ac
@@ -113,6 +113,7 @@ fi
 
 # Configure global pre-processor definitions.
 AC_DEFINE([_REENTRANT], [], [Define for reentrant code])
+AC_SYS_LARGEFILE
 # AC_DEFINE([_LARGEFILE64_SOURCE], [], [Define for 64-bit data files])
 # AC_DEFINE([_LARGEFILE_SOURCE], [], [Define for 64-bit data files])
 
diff --git a/xflaim/configure.ac b/xflaim/configure.ac
index 4287ae2..eda13ed 100644
--- a/xflaim/configure.ac
+++ b/xflaim/configure.ac
@@ -146,6 +146,7 @@ fi
 
 # Configure global pre-processor definitions.
 AC_DEFINE([_REENTRANT], [], [Define for reentrant code])
+AC_SYS_LARGEFILE
 # AC_DEFINE([_LARGEFILE64_SOURCE], [], [Define for 64-bit data files])
 # AC_DEFINE([_LARGEFILE_SOURCE], [], [Define for 64-bit data files])