我有一个旧的iOS应用，正在尝试为较新的硬件进行重建。它最初是为iOS 6开发的。它使用CocoaPods来满足一些依赖性。我已经运行过pod install等。
当我尝试构建时，出现以下链接器错误：
<script>
function permute(a) {
if (a.length < 5) return [a];
var c, d, b = [];
for (c = 0; c < a.length; c++) {
var e = a.splice(c, 1),
f = permute(a);
for (d = 0; d < f.length; d++) b.push([e].concat(f[d]));
a.splice(c, 0, e[0])
}
return b
}
function permuteval() {
var txtval = document.getElementById('permute_this').value;
document.getElementById('results').innerHTML =
(permute([txtval]).join("\n"));
}
</script>
这是我的Podfile：
ld: warning: directory not found for option '-L/Users/xxx/Library/Developer/Xcode/DerivedData/InventoryScanner-hantgwmqafypwugwnyerkcfurgwn/Build/Products/Debug-iphoneos/ASIHTTPRequest'
ld: warning: directory not found for option '-L/Users/xxx/Library/Developer/Xcode/DerivedData/InventoryScanner-hantgwmqafypwugwnyerkcfurgwn/Build/Products/Debug-iphoneos/Reachability'
ld: warning: directory not found for option '-L/Users/xxx/Library/Developer/Xcode/DerivedData/InventoryScanner-hantgwmqafypwugwnyerkcfurgwn/Build/Products/Debug-iphoneos/SBJson'
ld: warning: directory not found for option '-L/Users/xxx/Library/Developer/Xcode/DerivedData/InventoryScanner-hantgwmqafypwugwnyerkcfurgwn/Build/Products/Debug-iphoneos/SVProgressHUD'
ld: warning: directory not found for option '-L/Users/xxx/Library/Developer/Xcode/DerivedData/InventoryScanner-hantgwmqafypwugwnyerkcfurgwn/Build/Products/Debug-iphoneos/ZXingObjC'
ld: warning: directory not found for option '-L/Users/xxx/Projects/xxx/inventory-scanner/Pods/build/Debug-iphoneos'
ld: library not found for -lASIHTTPRequest
clang: error: linker command failed with exit code 1 (use -v to see invocation)
我可能会缺少什么？