We upgraded ipxe in 38ab99b2 ("ipxe: update to new commit"). That
version of ipxe requires liblzma to build.

Check that in configure and document this in README.

Signed-off-by: Wei Liu <wei.l...@citrix.com>
---
Cc: Ian Jackson <ian.jack...@eu.citrix.com>

Rerun autogen.sh while committing.
---
 README             |   1 +
 tools/config.h.in  |   3 ++
 tools/configure    | 139 +++++++++++++++++++++++++++++++++++------------------
 tools/configure.ac |   2 +
 4 files changed, 99 insertions(+), 46 deletions(-)

diff --git a/README b/README
index 91f4a8b..b370ce2 100644
--- a/README
+++ b/README
@@ -82,6 +82,7 @@ disabled at compile time:
       information.
     * 16-bit x86 assembler, loader and compiler for qemu-traditional / rombios
       (dev86 rpm or bin86 & bcc debs)
+    * Development install of liblzma for rombios
 
 Second, you need to acquire a suitable kernel for use in domain 0. If
 possible you should use a kernel provided by your OS distributor. If
diff --git a/tools/config.h.in b/tools/config.h.in
index f65eec4..58856bc 100644
--- a/tools/config.h.in
+++ b/tools/config.h.in
@@ -36,6 +36,9 @@
 /* Define to 1 if you have the `fdt' library (-lfdt). */
 #undef HAVE_LIBFDT
 
+/* Define to 1 if you have the `lzma' library (-llzma). */
+#undef HAVE_LIBLZMA
+
 /* Define to 1 if you have the `yajl' library (-lyajl). */
 #undef HAVE_LIBYAJL
 
diff --git a/tools/configure b/tools/configure
index e3cc3ea..25edfee 100755
--- a/tools/configure
+++ b/tools/configure
@@ -1696,6 +1696,52 @@ fi
 
 } # ac_fn_c_try_compile
 
+# ac_fn_c_try_link LINENO
+# -----------------------
+# Try to link conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_link ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  rm -f conftest.$ac_objext conftest$ac_exeext
+  if { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && {
+        test -z "$ac_c_werror_flag" ||
+        test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+        test "$cross_compiling" = yes ||
+        test -x conftest$ac_exeext
+       }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+       ac_retval=1
+fi
+  # Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
+  # created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
+  # interfere with the next link command; also delete a directory that is
+  # left behind by Apple's compiler.  We do this before executing the actions.
+  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_link
+
 # ac_fn_c_try_cpp LINENO
 # ----------------------
 # Try to preprocess conftest.$ac_ext, and return whether this succeeded.
@@ -1897,52 +1943,6 @@ $as_echo "$ac_res" >&6; }
 
 } # ac_fn_c_check_header_compile
 
-# ac_fn_c_try_link LINENO
-# -----------------------
-# Try to link conftest.$ac_ext, and return whether this succeeded.
-ac_fn_c_try_link ()
-{
-  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  rm -f conftest.$ac_objext conftest$ac_exeext
-  if { { ac_try="$ac_link"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
-$as_echo "$ac_try_echo"; } >&5
-  (eval "$ac_link") 2>conftest.err
-  ac_status=$?
-  if test -s conftest.err; then
-    grep -v '^ *+' conftest.err >conftest.er1
-    cat conftest.er1 >&5
-    mv -f conftest.er1 conftest.err
-  fi
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; } && {
-        test -z "$ac_c_werror_flag" ||
-        test ! -s conftest.err
-       } && test -s conftest$ac_exeext && {
-        test "$cross_compiling" = yes ||
-        test -x conftest$ac_exeext
-       }; then :
-  ac_retval=0
-else
-  $as_echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-       ac_retval=1
-fi
-  # Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
-  # created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
-  # interfere with the next link command; also delete a directory that is
-  # left behind by Apple's compiler.  We do this before executing the actions.
-  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
-  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
-  as_fn_set_status $ac_retval
-
-} # ac_fn_c_try_link
-
 # ac_fn_c_check_func LINENO FUNC VAR
 # ----------------------------------
 # Tests whether FUNC exists, setting the cache variable VAR accordingly
@@ -4383,6 +4383,53 @@ if test x"${BCC}" = x"no"
 then
     as_fn_error $? "Unable to find bcc, please install bcc" "$LINENO" 5
 fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for lzma_version_number 
in -llzma" >&5
+$as_echo_n "checking for lzma_version_number in -llzma... " >&6; }
+if ${ac_cv_lib_lzma_lzma_version_number+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-llzma  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char lzma_version_number ();
+int
+main ()
+{
+return lzma_version_number ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_lzma_lzma_version_number=yes
+else
+  ac_cv_lib_lzma_lzma_version_number=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: 
$ac_cv_lib_lzma_lzma_version_number" >&5
+$as_echo "$ac_cv_lib_lzma_lzma_version_number" >&6; }
+if test "x$ac_cv_lib_lzma_lzma_version_number" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBLZMA 1
+_ACEOF
+
+  LIBS="-llzma $LIBS"
+
+else
+  as_fn_error $? "Could not find lzma, needed to build rombios" "$LINENO" 5
+fi
+
 
 $as_echo "#define HAVE_ROMBIOS 1" >>confdefs.h
 
diff --git a/tools/configure.ac b/tools/configure.ac
index 794c615..1a8e493 100644
--- a/tools/configure.ac
+++ b/tools/configure.ac
@@ -173,6 +173,8 @@ AS_IF([test "x$enable_rombios" = "xyes"], [
     AX_PATH_PROG_OR_FAIL([AS86], [as86])
     AX_PATH_PROG_OR_FAIL([LD86], [ld86])
     AX_PATH_PROG_OR_FAIL([BCC], [bcc])
+    AC_CHECK_LIB([lzma], [lzma_version_number], [],
+        [AC_MSG_ERROR([Could not find lzma, needed to build rombios])])
     AC_DEFINE([HAVE_ROMBIOS], [1], [ROMBIOS enabled])
     rombios=y],[
     rombios=n
-- 
2.1.4


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