diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66d68f5c..00a45442 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Added option `GPU_PHYSICS` which defaults to `OFF`. When `ON`, available
+  OpenACC ports of Phsyics routines will be built instead of their original
+  versions.
+
 ### Changed
 
 ## [3.30.0] - 2023-06-23
diff --git a/compiler/flags/GNU_Fortran.cmake b/compiler/flags/GNU_Fortran.cmake
index 9140d491..7c34c544 100644
--- a/compiler/flags/GNU_Fortran.cmake
+++ b/compiler/flags/GNU_Fortran.cmake
@@ -110,6 +110,10 @@ set (NO_ALIAS "")
 
 set (NO_RANGE_CHECK "-fno-range-check")
 
+set (OPENACC_COMPILE "-fopenacc")
+set (OPENACC_OFFLOAD_TARGETS "-foffload=nvptx-none")
+set (OPENACC_OFFLOAD_OPTIONS "-foffload=-lgfortran -lgomp -lm")
+
 cmake_host_system_information(RESULT proc_description QUERY PROCESSOR_DESCRIPTION)
 
 if ( ${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL aarch64 )
@@ -202,6 +206,10 @@ endif ()
 #set (GEOS_Fortran_Aggressive_Flags "-O2 -march=native -ffast-math -ftree-vectorize -funroll-loops --param max-unroll-times=4 ${PREFER_AVX128} -mno-fma -mveclibabi=svml")
 #set (GEOS_Fortran_Aggressive_FPE_Flags "${DEBINFO} ${TRACEBACK} ${MISMATCH} ${ALLOW_BOZ}")
 
+# OpenACC flags
+# -------------
+set (GEOS_Fortran_OpenACC_Flags "${OPENACC_COMPILE} ${OPENACC_OFFLOAD_TARGETS}")
+set (GEOS_Fortran_OpenACC_Flags_Offload_Libs "${OPENACC_COMPILE} ${OPENACC_OFFLOAD_OPTIONS} ${OPENACC_OFFLOAD_TARGETS}")
 
 # Common variables for every compiler
 include(Generic_Fortran)
diff --git a/esma.cmake b/esma.cmake
index 6debfc16..0c5e5db7 100644
--- a/esma.cmake
+++ b/esma.cmake
@@ -24,6 +24,13 @@ option(BUILD_SHARED_LIBS "Build the shared library" OFF)
 set (ECBUILD_2_COMPAT_VALUE OFF)
 include (ecbuild_system NO_POLICY_SCOPE)
 
+### GPU Physics ###
+
+option(GPU_PHYSICS "Build GPU ports of Physics components" OFF)
+if (GPU_PHYSICS)
+  find_package (OpenACC)
+endif ()
+
 ### Compiler Support ###
 
 list (APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/compiler")