diff --git a/gradle.properties b/gradle.properties
index 3fe854daa54..c00726767c0 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -46,6 +46,9 @@ org.gradle.vfs.watch=true
 # Enable compilation of project using FIR compiler
 #kotlin.build.useFir=true
 
+# Enable FIR compiler for kotlin-stdlib, kotlin-reflect, kotlin-test.
+#kotlin.build.useFirForLibraries=true
+
 # Enable overriding JDK 6 and JDK 7 with JDK 8 in java toolchains
 # This flag is required if you don't have JDK 6 or JDK 7 manually installed
 #kotlin.build.isObsoleteJdkOverrideEnabled=true
diff --git a/libraries/commonConfiguration.gradle b/libraries/commonConfiguration.gradle
index 3a9121a18bd..f1b7f51e39b 100644
--- a/libraries/commonConfiguration.gradle
+++ b/libraries/commonConfiguration.gradle
@@ -64,6 +64,16 @@ ext.configurePluginMarkers = { Project project, withEmptyJars = true ->
     PluginMarkersKt.publishPluginMarkers(project, withEmptyJars)
 }
 
+ext.configureFrontendIr = { Project project ->
+    project.tasks.withType(KotlinCompile.class) { task ->
+        task.kotlinOptions {
+            if (project.kotlinBuildProperties.useFirForLibraries) {
+                freeCompilerArgs += "-Xuse-fir"
+            }
+        }
+    }
+}
+
 allprojects { project ->
     project.ext.configureSourcesJar = { lambda = {} ->
         ArtifactsKt.sourcesJar(project) { task ->
diff --git a/libraries/kotlin.test/junit/build.gradle b/libraries/kotlin.test/junit/build.gradle
index d1f8ce9495a..0848158c8f3 100644
--- a/libraries/kotlin.test/junit/build.gradle
+++ b/libraries/kotlin.test/junit/build.gradle
@@ -44,6 +44,8 @@ compileTestKotlin {
     ]
 }
 
+configureFrontendIr(project)
+
 if (includeJava9) {
     LibrariesCommon.configureJava9Compilation(project, 'kotlin.test.junit')
 }
diff --git a/libraries/kotlin.test/junit5/build.gradle b/libraries/kotlin.test/junit5/build.gradle
index 1598be8a296..cca890788af 100644
--- a/libraries/kotlin.test/junit5/build.gradle
+++ b/libraries/kotlin.test/junit5/build.gradle
@@ -43,6 +43,8 @@ compileTestKotlin {
     ]
 }
 
+configureFrontendIr(project)
+
 if (includeJava9) {
     LibrariesCommon.configureJava9Compilation(project, 'kotlin.test.junit5')
 }
diff --git a/libraries/kotlin.test/jvm/build.gradle b/libraries/kotlin.test/jvm/build.gradle
index e6ae945f85e..97cab72bd5c 100644
--- a/libraries/kotlin.test/jvm/build.gradle
+++ b/libraries/kotlin.test/jvm/build.gradle
@@ -57,6 +57,8 @@ compileTestKotlin {
     ]
 }
 
+configureFrontendIr(project)
+
 if (includeJava9) {
     LibrariesCommon.configureJava9Compilation(project, 'kotlin.test')
 }
diff --git a/libraries/kotlin.test/testng/build.gradle b/libraries/kotlin.test/testng/build.gradle
index 7e2ff6bb38e..1b77e295028 100644
--- a/libraries/kotlin.test/testng/build.gradle
+++ b/libraries/kotlin.test/testng/build.gradle
@@ -47,6 +47,8 @@ compileTestKotlin {
     ]
 }
 
+configureFrontendIr(project)
+
 if (includeJava9) {
     LibrariesCommon.configureJava9Compilation(project, 'kotlin.test.testng')
 }
diff --git a/libraries/reflect/api/build.gradle b/libraries/reflect/api/build.gradle
index c3107da00cf..4484e5e455e 100644
--- a/libraries/reflect/api/build.gradle
+++ b/libraries/reflect/api/build.gradle
@@ -54,6 +54,8 @@ compileKotlin {
     }
 }
 
+configureFrontendIr(project)
+
 jar {
     manifestAttributes(manifest, project, "internal")
 }
diff --git a/libraries/stdlib/jdk7/build.gradle b/libraries/stdlib/jdk7/build.gradle
index ea29f3d04c7..1ca7281c8b6 100644
--- a/libraries/stdlib/jdk7/build.gradle
+++ b/libraries/stdlib/jdk7/build.gradle
@@ -90,6 +90,8 @@ compileTestKotlin {
     ]
 }
 
+configureFrontendIr(project)
+
 LibrariesCommon.configureJava9Compilation(project, 'kotlin.stdlib.jdk7')
 
 task testJdk6Tests(type: Test) {
diff --git a/libraries/stdlib/jdk8/build.gradle b/libraries/stdlib/jdk8/build.gradle
index f94adbcf542..82873946bf4 100644
--- a/libraries/stdlib/jdk8/build.gradle
+++ b/libraries/stdlib/jdk8/build.gradle
@@ -75,6 +75,8 @@ compileTestKotlin {
     ]
 }
 
+configureFrontendIr(project)
+
 LibrariesCommon.configureJava9Compilation(project, 'kotlin.stdlib.jdk8')
 
 task testJdk6Tests(type: Test) { thisTask ->
diff --git a/libraries/stdlib/jvm/build.gradle b/libraries/stdlib/jvm/build.gradle
index aab2a3e2bd5..bfb2df0b6c3 100644
--- a/libraries/stdlib/jvm/build.gradle
+++ b/libraries/stdlib/jvm/build.gradle
@@ -143,6 +143,8 @@ compileLongRunningTestKotlin {
     kotlinOptions.freeCompilerArgs += "-opt-in=kotlin.ExperimentalStdlibApi"
 }
 
+configureFrontendIr(project)
+
 task longRunningTest(type: Test, dependsOn: longRunningTestClasses) {
     group = "verification"
     testClassesDirs = sourceSets.longRunningTest.output.classesDirs
diff --git a/libraries/tools/kotlin-annotations-jvm/build.gradle b/libraries/tools/kotlin-annotations-jvm/build.gradle
index ff7b0eff199..7b09125614b 100644
--- a/libraries/tools/kotlin-annotations-jvm/build.gradle
+++ b/libraries/tools/kotlin-annotations-jvm/build.gradle
@@ -27,3 +27,5 @@ compileKotlin {
     ]
     kotlinOptions.moduleName = project.name
 }
+
+configureFrontendIr(project)
diff --git a/libraries/tools/script-runtime/build.gradle b/libraries/tools/script-runtime/build.gradle
index 46a031983c8..ba7e9bf374a 100644
--- a/libraries/tools/script-runtime/build.gradle
+++ b/libraries/tools/script-runtime/build.gradle
@@ -40,3 +40,5 @@ compileKotlin {
     ]
     kotlinOptions.moduleName = project.name
 }
+
+configureFrontendIr(project)