diff --git a/src/host/genversion.lua b/src/host/genversion.lua
index a38cec56..42b5e6fe 100644
--- a/src/host/genversion.lua
+++ b/src/host/genversion.lua
@@ -5,9 +5,9 @@
 -- Released under the MIT license. See Copyright Notice in luajit.h
 ----------------------------------------------------------------------------
 
-local FILE_INPUT_H = "luajit_rolling.h"
-local FILE_INPUT_R = "luajit_relver.txt"
-local FILE_OUTPUT_H = "luajit.h"
+local FILE_ROLLING_H = "luajit_rolling.h"
+local FILE_RELVER_TXT = "luajit_relver.txt"
+local FILE_LUAJIT_H = "luajit.h"
 
 local function file_read(file)
   local fp = assert(io.open(file, "rb"), "run from the wrong directory")
@@ -28,8 +28,8 @@ local function file_write_mod(file, data)
   assert(fp:close())
 end
 
-local text = file_read(FILE_INPUT_H)
-local relver = file_read(FILE_INPUT_R):match("(%d+)")
+local text = file_read(FILE_ROLLING_H)
+local relver = file_read(FILE_RELVER_TXT):match("(%d+)")
 
 if relver then
   text = text:gsub("ROLLING", relver)
@@ -38,6 +38,7 @@ else
 **** WARNING Cannot determine rolling release version from git log.
 **** WARNING The 'git' command must be available during the build.
 ]])
+  file_write_mod(FILE_RELVER_TXT, "ROLLING\n") -- Fallback for install target.
 end
 
-file_write_mod(FILE_OUTPUT_H, text)
+file_write_mod(FILE_LUAJIT_H, text)
diff --git a/src/msvcbuild.bat b/src/msvcbuild.bat
index 44d9e48b..f9bf2528 100644
--- a/src/msvcbuild.bat
+++ b/src/msvcbuild.bat
@@ -51,7 +51,7 @@ if exist minilua.exe.manifest^
 minilua %DASM% -LN %DASMFLAGS% -o host\buildvm_arch.h %DASC%
 @if errorlevel 1 goto :BAD
 
-git show -s --format=%%ct >luajit_relver.txt
+if exist ..\.git ( git show -s --format=%%ct >luajit_relver.txt ) else ( type ..\.relver >luajit_relver.txt )
 minilua host\genversion.lua
 
 %LJCOMPILE% /I "." /I %DASMDIR% host\buildvm*.c
diff --git a/src/nxbuild.bat b/src/nxbuild.bat
index ab36dd8b..7f84b747 100644
--- a/src/nxbuild.bat
+++ b/src/nxbuild.bat
@@ -73,7 +73,7 @@ if exist minilua.exe.manifest^
 minilua %DASM% -LN %DASMFLAGS% -o host\buildvm_arch.h %DASC%
 @if errorlevel 1 goto :BAD
 
-git show -s --format=%%ct >luajit_relver.txt
+if exist ..\.git ( git show -s --format=%%ct >luajit_relver.txt ) else ( type ..\.relver >luajit_relver.txt )
 minilua host\genversion.lua
 
 %LJCOMPILE% /I "." /I %DASMDIR% %DASMTARGET% -D LJ_TARGET_NX -DLUAJIT_OS=LUAJIT_OS_OTHER -DLUAJIT_DISABLE_JIT -DLUAJIT_DISABLE_FFI host\buildvm*.c
diff --git a/src/ps4build.bat b/src/ps4build.bat
index 52a9e7d7..d6f73e5a 100644
--- a/src/ps4build.bat
+++ b/src/ps4build.bat
@@ -51,7 +51,7 @@ if exist minilua.exe.manifest^
 minilua %DASM% -LN %DASMFLAGS% -o host\buildvm_arch.h %DASC%
 @if errorlevel 1 goto :BAD
 
-git show -s --format=%%ct >luajit_relver.txt
+if exist ..\.git ( git show -s --format=%%ct >luajit_relver.txt ) else ( type ..\.relver >luajit_relver.txt )
 minilua host\genversion.lua
 
 %LJCOMPILE% /I "." /I %DASMDIR% %GC64% -DLUAJIT_TARGET=LUAJIT_ARCH_X64 -DLUAJIT_OS=LUAJIT_OS_OTHER -DLUAJIT_DISABLE_JIT -DLUAJIT_DISABLE_FFI -DLUAJIT_USE_SYSMALLOC -DLUAJIT_NO_UNWIND host\buildvm*.c
diff --git a/src/ps5build.bat b/src/ps5build.bat
index ec98a88a..30b719d6 100644
--- a/src/ps5build.bat
+++ b/src/ps5build.bat
@@ -51,7 +51,7 @@ if exist minilua.exe.manifest^
 minilua %DASM% -LN %DASMFLAGS% -o host\buildvm_arch.h %DASC%
 @if errorlevel 1 goto :BAD
 
-git show -s --format=%%ct >luajit_relver.txt
+if exist ..\.git ( git show -s --format=%%ct >luajit_relver.txt ) else ( type ..\.relver >luajit_relver.txt )
 minilua host\genversion.lua
 
 %LJCOMPILE% /I "." /I %DASMDIR% %GC64% -DLUAJIT_TARGET=LUAJIT_ARCH_X64 -DLUAJIT_OS=LUAJIT_OS_OTHER -DLUAJIT_DISABLE_JIT -DLUAJIT_DISABLE_FFI -DLUAJIT_NO_UNWIND host\buildvm*.c
diff --git a/src/psvitabuild.bat b/src/psvitabuild.bat
index 770dd80e..8d176e52 100644
--- a/src/psvitabuild.bat
+++ b/src/psvitabuild.bat
@@ -31,7 +31,7 @@ if exist minilua.exe.manifest^
 minilua %DASM% -LN %DASMFLAGS% -o host\buildvm_arch.h vm_arm.dasc
 @if errorlevel 1 goto :BAD
 
-git show -s --format=%%ct >luajit_relver.txt
+if exist ..\.git ( git show -s --format=%%ct >luajit_relver.txt ) else ( type ..\.relver >luajit_relver.txt )
 minilua host\genversion.lua
 
 %LJCOMPILE% /I "." /I %DASMDIR% -DLUAJIT_TARGET=LUAJIT_ARCH_ARM -DLUAJIT_OS=LUAJIT_OS_OTHER -DLUAJIT_DISABLE_JIT -DLUAJIT_DISABLE_FFI -DLJ_TARGET_PSVITA=1 host\buildvm*.c
diff --git a/src/xb1build.bat b/src/xb1build.bat
index 250138ad..019d6ebe 100644
--- a/src/xb1build.bat
+++ b/src/xb1build.bat
@@ -31,7 +31,7 @@ if exist minilua.exe.manifest^
 minilua %DASM% -LN %DASMFLAGS% -o host\buildvm_arch.h vm_x64.dasc
 @if errorlevel 1 goto :BAD
 
-git show -s --format=%%ct >luajit_relver.txt
+if exist ..\.git ( git show -s --format=%%ct >luajit_relver.txt ) else ( type ..\.relver >luajit_relver.txt )
 minilua host\genversion.lua
 
 %LJCOMPILE% /I "." /I %DASMDIR% /D_DURANGO host\buildvm*.c
diff --git a/src/xedkbuild.bat b/src/xedkbuild.bat
index b8fd0461..5444024e 100644
--- a/src/xedkbuild.bat
+++ b/src/xedkbuild.bat
@@ -31,7 +31,7 @@ if exist minilua.exe.manifest^
 minilua %DASM% -LN %DASMFLAGS% -o host\buildvm_arch.h vm_ppc.dasc
 @if errorlevel 1 goto :BAD
 
-git show -s --format=%%ct >luajit_relver.txt
+if exist ..\.git ( git show -s --format=%%ct >luajit_relver.txt ) else ( type ..\.relver >luajit_relver.txt )
 minilua host\genversion.lua
 
 %LJCOMPILE% /I "." /I %DASMDIR% /D_XBOX_VER=200 /DLUAJIT_TARGET=LUAJIT_ARCH_PPC  host\buildvm*.c