diff --git a/docs/changelog.md b/docs/changelog.md
index 02fd9c432..ba5c78276 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -60,6 +60,8 @@ SPDX-FileCopyrightText: 2011-2020 Carles Fernandez-Prades <carles.fernandez@cttc
 - The `Custom_UDP_Signal_Source` implementation now accepts
   `SignalSource.sample_type=cfloat`, in addition to the existing 4 and 8-bit
   length sample types.
+- Fixed the `obsdiff` and `rinex2assist` utilities when installed if they were
+  built with a locally downloaded version of GPSTk.
 
 &nbsp;
 
diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
index 0634d40e3..f37086771 100644
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -340,12 +340,14 @@ if(ENABLE_UNIT_TESTING_EXTRA OR ENABLE_SYSTEM_TESTING_EXTRA OR ENABLE_FPGA)
             set(GPSTK_BUILD_COMMAND "xcodebuild" "-configuration" "${CMAKE_BUILD_TYPE}")
         endif()
         include(GNUInstallDirs)
+        find_program(Patch_EXECUTABLE NAME patch PATHS ENV PATH)
         if(CMAKE_VERSION VERSION_LESS 3.2)
             ExternalProject_Add(gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}
                 GIT_REPOSITORY https://github.com/SGL-UT/GPSTk
                 GIT_TAG v${GNSSSDR_GPSTK_LOCAL_VERSION}
                 SOURCE_DIR ${CMAKE_BINARY_DIR}/thirdparty/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}
                 BINARY_DIR ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}
+                PATCH_COMMAND cd ${CMAKE_BINARY_DIR}/thirdparty/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION} && ${Patch_EXECUTABLE} ${CMAKE_BINARY_DIR}/thirdparty/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/CMakeLists.txt < ${CMAKE_SOURCE_DIR}/src/tests/data/gpstk_static.patch
                 CMAKE_ARGS ${GTEST_COMPILER} ${TOOLCHAIN_ARG} -DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install -DBUILD_EXT=OFF -DBUILD_PYTHON=OFF -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} -DCMAKE_CXX_STANDARD=11 -DCMAKE_CXX_EXTENSIONS=ON -DCMAKE_C_STANDARD=11 -DCMAKE_C_EXTENSIONS=ON
                 BUILD_COMMAND ${GPSTK_BUILD_COMMAND}
                 UPDATE_COMMAND ""
@@ -365,18 +367,19 @@ if(ENABLE_UNIT_TESTING_EXTRA OR ENABLE_SYSTEM_TESTING_EXTRA OR ENABLE_FPGA)
                 GIT_TAG v${GNSSSDR_GPSTK_LOCAL_VERSION}
                 SOURCE_DIR ${CMAKE_BINARY_DIR}/thirdparty/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}
                 BINARY_DIR ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}
+                PATCH_COMMAND cd ${CMAKE_BINARY_DIR}/thirdparty/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION} && ${Patch_EXECUTABLE} ${CMAKE_BINARY_DIR}/thirdparty/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/CMakeLists.txt < ${CMAKE_SOURCE_DIR}/src/tests/data/gpstk_static.patch
                 CMAKE_ARGS ${GTEST_COMPILER} ${TOOLCHAIN_ARG} -DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install -DBUILD_EXT=OFF -DBUILD_PYTHON=OFF -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} -DCMAKE_CXX_STANDARD=14 -DCMAKE_CXX_EXTENSIONS=ON -DCMAKE_C_STANDARD=11 -DCMAKE_C_EXTENSIONS=ON
                 BUILD_COMMAND ${GPSTK_BUILD_COMMAND} ${GPSTK_PARALLEL_BUILD}
-                BUILD_BYPRODUCTS ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}gpstk${CMAKE_SHARED_LIBRARY_SUFFIX}
+                BUILD_BYPRODUCTS ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}gpstk${CMAKE_STATIC_LIBRARY_SUFFIX}
                 UPDATE_COMMAND ""
                 PATCH_COMMAND ""
             )
         endif()
         set(GPSTK_INCLUDE_DIRS ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/include CACHE PATH "Local GPSTK headers")
-        set(GPSTK_LIBRARY ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}gpstk${CMAKE_SHARED_LIBRARY_SUFFIX})
+        set(GPSTK_LIBRARY ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}gpstk${CMAKE_STATIC_LIBRARY_SUFFIX})
         set(GPSTK_BINDIR ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/bin/)
         add_definitions(-DGPSTK_BINDIR="${GPSTK_BINDIR}")
-        add_library(Gpstk::gpstk SHARED IMPORTED)
+        add_library(Gpstk::gpstk STATIC IMPORTED)
         add_dependencies(Gpstk::gpstk gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION})
         file(MAKE_DIRECTORY ${GPSTK_INCLUDE_DIRS})
         file(MAKE_DIRECTORY ${GPSTK_INCLUDE_DIRS}/gpstk)
diff --git a/src/tests/data/gpstk_static.patch b/src/tests/data/gpstk_static.patch
index c30704367..97ff88d69 100644
--- a/src/tests/data/gpstk_static.patch
+++ b/src/tests/data/gpstk_static.patch
@@ -1,3 +1,5 @@
+SPDX-License-Identifier: GPL-3.0-or-later
+SPDX-FileCopyrightText: 2020 Carles Fernandez-Prades <carles.fernandez@cttc.es>
 --- CMakeLists.txt	2020-10-25 10:06:26.000000000 +0100
 +++ CMakeLists.txt	2020-10-25 10:06:11.000000000 +0100
 @@ -74,7 +74,7 @@
diff --git a/src/utils/rinex-tools/CMakeLists.txt b/src/utils/rinex-tools/CMakeLists.txt
index f49cebba6..5f907ecd8 100644
--- a/src/utils/rinex-tools/CMakeLists.txt
+++ b/src/utils/rinex-tools/CMakeLists.txt
@@ -12,7 +12,7 @@ if("${ARMADILLO_VERSION_STRING}" VERSION_GREATER "9.800" OR (NOT ARMADILLO_FOUND
     find_package(GPSTK QUIET)
     if(NOT GPSTK_FOUND OR ENABLE_OWN_GPSTK)
         include(GNUInstallDirs)
-        set(GPSTK_LIBRARY ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}gpstk${CMAKE_SHARED_LIBRARY_SUFFIX})
+        set(GPSTK_LIBRARY ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}gpstk${CMAKE_STATIC_LIBRARY_SUFFIX})
         set(GPSTK_INCLUDE_DIR ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/include)
     endif()
 
diff --git a/src/utils/rinex2assist/CMakeLists.txt b/src/utils/rinex2assist/CMakeLists.txt
index 53d1a8d6d..4cfa92350 100644
--- a/src/utils/rinex2assist/CMakeLists.txt
+++ b/src/utils/rinex2assist/CMakeLists.txt
@@ -10,7 +10,7 @@
 find_package(GPSTK QUIET)
 if(NOT GPSTK_FOUND OR ENABLE_OWN_GPSTK)
     include(GNUInstallDirs)
-    set(GPSTK_LIBRARY ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}gpstk${CMAKE_SHARED_LIBRARY_SUFFIX})
+    set(GPSTK_LIBRARY ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/${CMAKE_INSTALL_LIBDIR}/${CMAKE_FIND_LIBRARY_PREFIXES}gpstk${CMAKE_STATIC_LIBRARY_SUFFIX})
     set(GPSTK_INCLUDE_DIR ${CMAKE_BINARY_DIR}/gpstk-${GNSSSDR_GPSTK_LOCAL_VERSION}/install/include)
 endif()