diff --git a/CMakeLists.txt b/CMakeLists.txt
index 350da80..1d2c74b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -80,11 +80,25 @@ if( "${PROJECT_SOURCE_DIR}" STREQUAL "${CMAKE_SOURCE_DIR}" )
 endif( "${PROJECT_SOURCE_DIR}" STREQUAL "${CMAKE_SOURCE_DIR}" )
 
 # configure avr-libcpp
-set( AVRLIBCPP_SUPPRESS_SFR_MACROS ON CACHE INTERNAL "" )
+option(
+    PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP
+    "picolibrary-microchip-megaavr0: use parent project's avr-libcpp"
+    ON
+)
+
+if( NOT ${PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP} )
+    set( AVRLIBCPP_SUPPRESS_SFR_MACROS ON CACHE INTERNAL "" )
+endif( NOT ${PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP} )
+
+if( NOT ${AVRLIBCPP_SUPPRESS_SFR_MACROS} )
+    message( FATAL_ERROR "AVRLIBCPP_SUPPRESS_SFR_MACROS must be ON" )
+endif( NOT ${AVRLIBCPP_SUPPRESS_SFR_MACROS} )
 
-add_subdirectory( avr-libcpp )
+if( NOT ${PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP} )
+    add_subdirectory( avr-libcpp )
 
-link_libraries( avr-libcpp )
+    link_libraries( avr-libcpp )
+endif( NOT ${PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP} )
 
 # configure picolibrary
 set( PICOLIBRARY_ENABLE_AUTOMATED_TESTING OFF CACHE INTERNAL "" )
diff --git a/configuration/release-atmega1608/CMakeLists.txt b/configuration/release-atmega1608/CMakeLists.txt
index ed5a7d0..d65796d 100644
--- a/configuration/release-atmega1608/CMakeLists.txt
+++ b/configuration/release-atmega1608/CMakeLists.txt
@@ -21,6 +21,9 @@ set( CMAKE_EXPORT_COMPILE_COMMANDS        ON           CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_F_CPU "16000000UL" CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_MCU   "atmega1608" CACHE INTERNAL "" )
 
+# avr-libcpp configuration
+set( PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP OFF CACHE INTERNAL "" )
+
 # picolibrary configuration
 set( PICOLIBRARY_SUPPRESS_ASSERTION_FAILURE_LOCATION_INFORMATION OFF CACHE INTERNAL "" )
 set( PICOLIBRARY_SUPPRESS_HUMAN_READABLE_ERROR_INFORMATION       OFF CACHE INTERNAL "" )
diff --git a/configuration/release-atmega1609/CMakeLists.txt b/configuration/release-atmega1609/CMakeLists.txt
index e9896ad..fc2fdcd 100644
--- a/configuration/release-atmega1609/CMakeLists.txt
+++ b/configuration/release-atmega1609/CMakeLists.txt
@@ -21,6 +21,9 @@ set( CMAKE_EXPORT_COMPILE_COMMANDS        ON           CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_F_CPU "16000000UL" CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_MCU   "atmega1609" CACHE INTERNAL "" )
 
+# avr-libcpp configuration
+set( PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP OFF CACHE INTERNAL "" )
+
 # picolibrary configuration
 set( PICOLIBRARY_SUPPRESS_ASSERTION_FAILURE_LOCATION_INFORMATION OFF CACHE INTERNAL "" )
 set( PICOLIBRARY_SUPPRESS_HUMAN_READABLE_ERROR_INFORMATION       OFF CACHE INTERNAL "" )
diff --git a/configuration/release-atmega3208/CMakeLists.txt b/configuration/release-atmega3208/CMakeLists.txt
index a6fc9f3..b23f4ae 100644
--- a/configuration/release-atmega3208/CMakeLists.txt
+++ b/configuration/release-atmega3208/CMakeLists.txt
@@ -21,6 +21,9 @@ set( CMAKE_EXPORT_COMPILE_COMMANDS        ON           CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_F_CPU "16000000UL" CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_MCU   "atmega3208" CACHE INTERNAL "" )
 
+# avr-libcpp configuration
+set( PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP OFF CACHE INTERNAL "" )
+
 # picolibrary configuration
 set( PICOLIBRARY_SUPPRESS_ASSERTION_FAILURE_LOCATION_INFORMATION OFF CACHE INTERNAL "" )
 set( PICOLIBRARY_SUPPRESS_HUMAN_READABLE_ERROR_INFORMATION       OFF CACHE INTERNAL "" )
diff --git a/configuration/release-atmega3209/CMakeLists.txt b/configuration/release-atmega3209/CMakeLists.txt
index 4dfe3a6..54c3aaf 100644
--- a/configuration/release-atmega3209/CMakeLists.txt
+++ b/configuration/release-atmega3209/CMakeLists.txt
@@ -21,6 +21,9 @@ set( CMAKE_EXPORT_COMPILE_COMMANDS        ON           CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_F_CPU "16000000UL" CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_MCU   "atmega3209" CACHE INTERNAL "" )
 
+# avr-libcpp configuration
+set( PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP OFF CACHE INTERNAL "" )
+
 # picolibrary configuration
 set( PICOLIBRARY_SUPPRESS_ASSERTION_FAILURE_LOCATION_INFORMATION OFF CACHE INTERNAL "" )
 set( PICOLIBRARY_SUPPRESS_HUMAN_READABLE_ERROR_INFORMATION       OFF CACHE INTERNAL "" )
diff --git a/configuration/release-atmega4808/CMakeLists.txt b/configuration/release-atmega4808/CMakeLists.txt
index 8e541d6..db6d9e1 100644
--- a/configuration/release-atmega4808/CMakeLists.txt
+++ b/configuration/release-atmega4808/CMakeLists.txt
@@ -21,6 +21,9 @@ set( CMAKE_EXPORT_COMPILE_COMMANDS        ON           CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_F_CPU "16000000UL" CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_MCU   "atmega4808" CACHE INTERNAL "" )
 
+# avr-libcpp configuration
+set( PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP OFF CACHE INTERNAL "" )
+
 # picolibrary configuration
 set( PICOLIBRARY_SUPPRESS_ASSERTION_FAILURE_LOCATION_INFORMATION OFF CACHE INTERNAL "" )
 set( PICOLIBRARY_SUPPRESS_HUMAN_READABLE_ERROR_INFORMATION       OFF CACHE INTERNAL "" )
diff --git a/configuration/release-atmega4809/CMakeLists.txt b/configuration/release-atmega4809/CMakeLists.txt
index 5aa8cc8..15af050 100644
--- a/configuration/release-atmega4809/CMakeLists.txt
+++ b/configuration/release-atmega4809/CMakeLists.txt
@@ -21,6 +21,9 @@ set( CMAKE_EXPORT_COMPILE_COMMANDS        ON           CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_F_CPU "16000000UL" CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_MCU   "atmega4809" CACHE INTERNAL "" )
 
+# avr-libcpp configuration
+set( PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP OFF CACHE INTERNAL "" )
+
 # picolibrary configuration
 set( PICOLIBRARY_SUPPRESS_ASSERTION_FAILURE_LOCATION_INFORMATION OFF CACHE INTERNAL "" )
 set( PICOLIBRARY_SUPPRESS_HUMAN_READABLE_ERROR_INFORMATION       OFF CACHE INTERNAL "" )
diff --git a/configuration/release-atmega808/CMakeLists.txt b/configuration/release-atmega808/CMakeLists.txt
index 863b2b9..97705de 100644
--- a/configuration/release-atmega808/CMakeLists.txt
+++ b/configuration/release-atmega808/CMakeLists.txt
@@ -21,6 +21,9 @@ set( CMAKE_EXPORT_COMPILE_COMMANDS        ON           CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_F_CPU "16000000UL" CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_MCU   "atmega808"  CACHE INTERNAL "" )
 
+# avr-libcpp configuration
+set( PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP OFF CACHE INTERNAL "" )
+
 # picolibrary configuration
 set( PICOLIBRARY_SUPPRESS_ASSERTION_FAILURE_LOCATION_INFORMATION OFF CACHE INTERNAL "" )
 set( PICOLIBRARY_SUPPRESS_HUMAN_READABLE_ERROR_INFORMATION       OFF CACHE INTERNAL "" )
diff --git a/configuration/release-atmega809/CMakeLists.txt b/configuration/release-atmega809/CMakeLists.txt
index 0c33277..8eda913 100644
--- a/configuration/release-atmega809/CMakeLists.txt
+++ b/configuration/release-atmega809/CMakeLists.txt
@@ -21,6 +21,9 @@ set( CMAKE_EXPORT_COMPILE_COMMANDS        ON           CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_F_CPU "16000000UL" CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_MCU   "atmega809"  CACHE INTERNAL "" )
 
+# avr-libcpp configuration
+set( PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP OFF CACHE INTERNAL "" )
+
 # picolibrary configuration
 set( PICOLIBRARY_SUPPRESS_ASSERTION_FAILURE_LOCATION_INFORMATION OFF CACHE INTERNAL "" )
 set( PICOLIBRARY_SUPPRESS_HUMAN_READABLE_ERROR_INFORMATION       OFF CACHE INTERNAL "" )
diff --git a/configuration/testing-interactive-atmega4809-arduino-nano-every/CMakeLists.txt b/configuration/testing-interactive-atmega4809-arduino-nano-every/CMakeLists.txt
index 09ce8a2..6c9f05b 100644
--- a/configuration/testing-interactive-atmega4809-arduino-nano-every/CMakeLists.txt
+++ b/configuration/testing-interactive-atmega4809-arduino-nano-every/CMakeLists.txt
@@ -22,6 +22,9 @@ set( CMAKE_EXPORT_COMPILE_COMMANDS        ON           CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_F_CPU "16000000UL" CACHE INTERNAL "" )
 set( PICOLIBRARY_MICROCHIP_MEGAAVR0_MCU   "atmega4809" CACHE INTERNAL "" )
 
+# avr-libcpp configuration
+set( PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP OFF CACHE INTERNAL "" )
+
 # picolibrary configuration
 set( PICOLIBRARY_SUPPRESS_ASSERTION_FAILURE_LOCATION_INFORMATION OFF CACHE INTERNAL "" )
 set( PICOLIBRARY_SUPPRESS_HUMAN_READABLE_ERROR_INFORMATION       OFF CACHE INTERNAL "" )
diff --git a/docs/usage.md b/docs/usage.md
index 70dd53e..b6736b8 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -69,6 +69,13 @@ picolibrary-microchip-megaavr0 supports the following project configuration opti
           USART clock generator scaling factor (see
           [`include/picolibrary/testing/interactive/microchip/megaavr0/log.h`](https://github.com/apcountryman/picolibrary-microchip-megaavr0/blob/main/include/picolibrary/testing/interactive/microchip/megaavr0/log.h)
           for more information)
+- `PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP` (defaults to `ON`): use
+  parent project's avr-libcpp
+
+### avr-libcpp Configuration Requirements
+If `PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP` is `ON`, avr-libcpp must
+be configured as follows:
+- `AVRLIBCPP_SUPPRESS_SFR_MACROS` must be `ON`
 
 ## Development
 The repository's Git `pre-commit` hook script is the simplest way to configure, and build