netstandard Travis build problem

[jackfoxy]

Description

Problem with multi-targets

Repro steps

travis ci

Actual behavior

/usr/share/dotnet/sdk/2.1.4/Microsoft.Common.CurrentVersion.targets(1124,5): error MSB3644: The reference assemblies for framework ".NETFramework,Version=v4.6.1" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend. [/home/travis/build/fsprojects/FSharpx.Collections/src/FSharpx.Collections/FSharpx.Collections.fsproj]

current .yml:

language: csharp

sudo: required

dist: trusty # Ubuntu 14.04

dotnet : 2.1.4

before_install:
  - chmod +x build.sh
 
script: 
  - ./build.sh All

[jackfoxy]

Need to add this:

mono: 5.2.0

dotnet: 2.0.0

install:

  # workaround for missing .net 4.5 targing pack

  - export FrameworkPathOverride=$(dirname $(which mono))/../lib/mono/4.5/