diff --git a/eng/pipelines/common/platform-matrix.yml b/eng/pipelines/common/platform-matrix.yml
index 55934c91b61a12..1f6c14be291483 100644
--- a/eng/pipelines/common/platform-matrix.yml
+++ b/eng/pipelines/common/platform-matrix.yml
@@ -180,23 +180,25 @@ jobs:
         ${{ insert }}: ${{ parameters.jobParameters }}
 
 # FreeBSD
-
-# FreeBSD machines are currently offline. Re-enable in the official build when
-# the machines are healthy.
-
-# - template: xplat-setup.yml
-#   parameters:
-#     jobTemplate: ${{ parameters.jobTemplate }}
-#     osGroup: FreeBSD
-#     archType: x64
-#     jobParameters:
-#       runtimeFlavor: ${{ parameters.runtimeFlavor }}
-#       buildConfig: ${{ parameters.buildConfig }}
-#       # There are no FreeBSD helix queues, so we don't run tests at the moment.
-#       helixQueues:
-#         asString: ''
-#         asArray: []
-#       ${{ insert }}: ${{ parameters.jobParameters }}
+- ${{ if containsValue(parameters.platforms, 'FreeBSD_x64') }}:
+  - template: xplat-setup.yml
+    parameters:
+      jobTemplate: ${{ parameters.jobTemplate }}
+      helixQueuesTemplate: ${{ parameters.helixQueuesTemplate }}
+      osGroup: FreeBSD
+      archType: x64
+      platform: FreeBSD_x64
+      container:
+        image: ubuntu-18.04-cross-freebsd-11-20200407092345-a84b0d2
+        registry: mcr
+      jobParameters:
+        runtimeFlavor: ${{ parameters.runtimeFlavor }}
+        buildConfig: ${{ parameters.buildConfig }}
+        helixQueueGroup: ${{ parameters.helixQueueGroup }}
+        crossrootfsDir: '/crossrootfs/x64'
+        ${{ if eq(parameters.passPlatforms, true) }}:
+          platforms: ${{ parameters.platforms }}
+        ${{ insert }}: ${{ parameters.jobParameters }}
 
 # Android x64
 
diff --git a/eng/pipelines/common/xplat-setup.yml b/eng/pipelines/common/xplat-setup.yml
index 4467951602b7e7..b3620e27513d20 100644
--- a/eng/pipelines/common/xplat-setup.yml
+++ b/eng/pipelines/common/xplat-setup.yml
@@ -97,10 +97,6 @@ jobs:
           name: NetCoreInternal-Pool
           queue: BuildPool.Ubuntu.1604.Amd64
 
-        # FreeBSD builds only in the internal project
-        ${{ if and(eq(parameters.osGroup, 'FreeBSD'), ne(variables['System.TeamProject'], 'public')) }}:
-          name: dnceng-freebsd-internal
-
         # Public OSX Build Pool
         ${{ if eq(parameters.osGroup, 'OSX') }}:
           vmImage: 'macOS-10.14'
diff --git a/eng/pipelines/coreclr/templates/build-job.yml b/eng/pipelines/coreclr/templates/build-job.yml
index b343975a710b53..2e7cd7d6a0b663 100644
--- a/eng/pipelines/coreclr/templates/build-job.yml
+++ b/eng/pipelines/coreclr/templates/build-job.yml
@@ -66,10 +66,6 @@ jobs:
     - ${{ if and(ne(parameters.osGroup, 'Windows_NT'), eq(parameters.compilerName, 'clang')) }}:
       - name: compilerArg
         value: '-clang9'
-      # Our FreeBSD doesn't yet detect available clang versions, so pass it explicitly.
-      - ${{ if eq(parameters.osGroup, 'FreeBSD') }}:
-        - name: compilerArg
-          value: '-clang6.0'
       # Building for x64 MUSL happens on Alpine Linux and we need to use the stable version available there
       - ${{ if and(eq(parameters.osGroup, 'Linux'), eq(parameters.osSubgroup, '_musl'), eq(parameters.archType, 'x64')) }}:
         - name: compilerArg
@@ -128,7 +124,7 @@ jobs:
 
     # Build CoreCLR Runtime
     - ${{ if ne(parameters.osGroup, 'Windows_NT') }}:
-      - script: $(coreClrRepoRootDir)build-runtime$(scriptExt) $(buildConfig) $(archType) $(crossArg) -ci $(compilerArg) $(officialBuildIdArg)
+      - script: $(coreClrRepoRootDir)build-runtime$(scriptExt) $(buildConfig) $(archType) $(crossArg) $(osArg) -ci $(compilerArg) $(officialBuildIdArg)
         displayName: Build CoreCLR Runtime
     - ${{ if eq(parameters.osGroup, 'Windows_NT') }}:
       - script: set __TestIntermediateDir=int&&$(coreClrRepoRootDir)build-runtime$(scriptExt) $(buildConfig) $(archType) -ci $(enforcePgoArg) $(officialBuildIdArg)
@@ -139,11 +135,11 @@ jobs:
         displayName: Build Cross OS Linux DAC for Windows
 
     # Build CoreCLR Managed Components
-    - script: $(Build.SourcesDirectory)$(dir)build$(scriptExt) -subset clr.corelib+clr.nativecorelib+clr.tools+clr.packages $(crossArg) -arch $(archType) -c $(buildConfig) $(officialBuildIdArg) -ci
+    - script: $(Build.SourcesDirectory)$(dir)build$(scriptExt) -subset clr.corelib+clr.nativecorelib+clr.tools+clr.packages $(crossArg) -arch $(archType) $(osArg) -c $(buildConfig) $(officialBuildIdArg) -ci
       displayName: Build managed product components and packages
 
     # Build native test components
-    - script: $(coreClrRepoRootDir)build-test$(scriptExt) skipmanaged $(buildConfig) $(archType) $(crossArg) $(priorityArg) $(compilerArg) skipgeneratelayout
+    - script: $(coreClrRepoRootDir)build-test$(scriptExt) skipmanaged $(buildConfig) $(archType) $(crossArg) $(osArg) $(priorityArg) $(compilerArg) skipgeneratelayout
       displayName: Build native test components
 
     # Sign on Windows
diff --git a/eng/pipelines/coreclr/templates/xplat-pipeline-job.yml b/eng/pipelines/coreclr/templates/xplat-pipeline-job.yml
index aad6f7bf69fa40..c9f71a959fa61f 100644
--- a/eng/pipelines/coreclr/templates/xplat-pipeline-job.yml
+++ b/eng/pipelines/coreclr/templates/xplat-pipeline-job.yml
@@ -119,4 +119,11 @@ jobs:
     - ${{ each variable in parameters.variables }}:
       - ${{insert}}: ${{ variable }}
 
+    - name: osArg
+      value: ''
+
+    - ${{ if eq(parameters.osGroup, 'FreeBSD') }}:
+      - name: osArg
+        value: -os FreeBSD
+
     steps: ${{ parameters.steps }}
diff --git a/eng/pipelines/installer/jobs/base-job.yml b/eng/pipelines/installer/jobs/base-job.yml
index 3a6494b0b23df9..85e4fa1fc86e47 100644
--- a/eng/pipelines/installer/jobs/base-job.yml
+++ b/eng/pipelines/installer/jobs/base-job.yml
@@ -80,10 +80,10 @@ jobs:
       value: /p:OfficialBuildId=$(Build.BuildNumber)
 
   - name: buildCommandSourcesDirectory
-    ${{ if ne(parameters.osGroup, 'Linux') }}:
+    ${{ if not(in(parameters.osGroup, 'Linux', 'FreeBSD')) }}:
       value: '$(Build.SourcesDirectory)/'
     # This job runs within Docker containers, so Build.SourcesDirectory is not accurate.
-    ${{ if eq(parameters.osGroup, 'Linux') }}:
+    ${{ if in(parameters.osGroup, 'Linux', 'FreeBSD') }}:
       value: '/root/runtime/'
 
   ###
@@ -146,7 +146,7 @@ jobs:
         $(CommonMSBuildArgs)
         $(OfficialBuildArg)
 
-  - ${{ if eq(parameters.osGroup, 'Linux') }}:
+  - ${{ if in(parameters.osGroup, 'Linux', 'FreeBSD') }}:
 
     # Preserve the NuGet authentication env vars into the Docker container.
     # The 'NuGetAuthenticate' build step may have set these.
@@ -165,10 +165,6 @@ jobs:
           -e ROOTFS_DIR=${{ parameters.crossrootfsDir }}
           ${{ parameters.container }}
 
-    - ${{ if eq(parameters.name, 'FreeBSD_x64') }}:
-      - name: RunArguments
-        value: export DotNetBootstrapCliTarPath=/dotnet-sdk-freebsd-x64.tar &&
-
     - name: BuildScript
       value: ./build.sh
     - name: MSBuildScript
@@ -183,6 +179,7 @@ jobs:
     - name: CommonMSBuildArgs
       value: >-
         /p:Configuration=$(_BuildConfig)
+        /p:TargetOS=${{ parameters.osGroup }}
         /p:TargetArchitecture=${{ parameters.archType }}
         $(OfficialBuildArg)
 
diff --git a/eng/pipelines/libraries/base-job.yml b/eng/pipelines/libraries/base-job.yml
index df6f5e31a73468..503b30c5bd3dee 100644
--- a/eng/pipelines/libraries/base-job.yml
+++ b/eng/pipelines/libraries/base-job.yml
@@ -54,7 +54,7 @@ jobs:
         - ${{ if ne(parameters.testScope, '') }}:
           - _testScopeArg: -testscope ${{ parameters.testScope }}
 
-        - ${{ if eq(parameters.osGroup, 'Linux') }}:
+        - ${{ if in(parameters.osGroup, 'Linux', 'FreeBSD') }}:
           - _crossBuildPropertyArg: /p:CrossBuild=${{ ne(parameters.crossrootfsDir, '') }}
 
         - ${{ if and(eq(parameters.osGroup, 'Linux'), eq(parameters.osSubGroup, '_musl')) }}:
@@ -63,20 +63,8 @@ jobs:
         - ${{ if and(eq(parameters.osGroup, 'Linux'), eq(parameters.osSubGroup, ''), eq(parameters.archType, 'arm')) }}:
           - _runtimeOSArg: /p:RuntimeOS=ubuntu.16.04
 
-        # force a value for OS when cross-building WebAssembly
-        - ${{ if eq(parameters.osGroup, 'WebAssembly') }}:
-          - _runtimeOSArg: -os ${{ parameters.osGroup }}
-
-        # force a value for OS when cross-building tvOS on OSX
-        - ${{ if eq(parameters.osGroup, 'tvOS') }}:
-          - _runtimeOSArg: -os ${{ parameters.osGroup }}
-
-        # force a value for OS when cross-building iOS on OSX
-        - ${{ if eq(parameters.osGroup, 'iOS') }}:
-          - _runtimeOSArg: -os ${{ parameters.osGroup }}
-
-        # force a value for OS when cross-building Android on Linux
-        - ${{ if eq(parameters.osGroup, 'Android') }}:
+        # force a value for OS when cross-building
+        - ${{ if in(parameters.osGroup, 'WebAssembly', 'iOS', 'tvOS', 'Android', 'FreeBSD') }}:
           - _runtimeOSArg: -os ${{ parameters.osGroup }}
 
         - ${{ if ne(parameters.framework, '') }}:
diff --git a/eng/pipelines/runtime.yml b/eng/pipelines/runtime.yml
index 9a7b6d8ef5ea41..408c9f6741ee84 100644
--- a/eng/pipelines/runtime.yml
+++ b/eng/pipelines/runtime.yml
@@ -197,6 +197,7 @@ jobs:
     - Windows_NT_x86
     - Windows_NT_arm
     - Windows_NT_arm64
+    - FreeBSD_x64
     jobParameters:
       testGroup: innerloop
 
@@ -380,6 +381,7 @@ jobs:
     - Linux_x64
     - OSX_x64
     - Windows_NT_x64
+    - FreeBSD_x64
     jobParameters:
       liveRuntimeBuildConfig: release
 
@@ -494,6 +496,7 @@ jobs:
       - Linux_arm64
       - Linux_musl_x64
       - Windows_NT_x64
+      - FreeBSD_x64
     jobParameters:
       liveRuntimeBuildConfig: release
       liveLibrariesBuildConfig: ${{ variables.debugOnPrReleaseOnRolling }}
diff --git a/src/installer/corehost/cli/hostmisc/pal.unix.cpp b/src/installer/corehost/cli/hostmisc/pal.unix.cpp
index 65338b619bf8c2..3626761b0ecbb4 100644
--- a/src/installer/corehost/cli/hostmisc/pal.unix.cpp
+++ b/src/installer/corehost/cli/hostmisc/pal.unix.cpp
@@ -2,6 +2,10 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+#if defined(TARGET_FREEBSD)
+#define _WITH_GETLINE
+#endif
+
 #include "pal.h"
 #include "utils.h"
 #include "trace.h"