diff --git a/root/common/deps/build/project.yaml b/root/common/deps/build/project.yaml
index 4ea40284..8e6e3f58 100644
--- a/root/common/deps/build/project.yaml
+++ b/root/common/deps/build/project.yaml
@@ -2,3 +2,44 @@ title: Common Build Dependencies Project
 description: |
   Build-time dependency packages (Go toolchain, OBS source services) used by multiple projects.
 publish: false
+
+project-config: |
+  %if "%_repository" == "RockyLinux_8" || "%_repository" == "UBI_8"
+  ExpandFlags: module:llvm-toolset-rhel8
+  ExpandFlags: module:perl-5.26
+  ExpandFlags: module:perl-IO-Socket-SSL-2.066
+  ExpandFlags: module:perl-libwww-perl-6.34
+  Prefer: selinux-policy-targeted
+  %endif
+
+  %if "%_repository" == "RockyLinux_9"
+  ExpandFlags: module:llvm-toolset-rhel9
+  # hdf-libs (EPEL split package) and hdf both provide libdf.so.0 and libmfhdf.so.0
+  Prefer: hdf-libs
+  %endif
+
+  %if "%_repository" == "RockyLinux_10"
+  Prefer: llvm-libs
+  %endif
+
+  %if "%_repository" == "Debian_11" || "%_repository" == "Debian_12" || "%_repository" == "Ubuntu_22.04"
+  # llvm-*-dev needs libtinfo-dev; both libncurses-dev and libtinfo-dev satisfy
+  # it and OBS reports "have choice" without a Prefer.
+  Prefer: libncurses-dev
+  # logrotate Recommends a cron daemon; both cron and bcron may be available.
+  Prefer: cron
+  %endif
+
+  %if "%_repository" == "Debian_11" || "%_repository" == "Debian_12" || "%_repository" == "Debian_13" || "%_repository" == "Ubuntu_22.04" || "%_repository" == "Ubuntu_24.04"
+  Prefer: golang-1.26
+  %endif
+
+  %if "%_repository" == "Debian_11" || "%_repository" == "Debian_12" || "%_repository" == "Debian_13" || "%_repository" == "Ubuntu_22.04" || "%_repository" == "Ubuntu_24.04" || "%_repository" == "Ubuntu_26.04"
+  # libgdal-dev transitively requires both libcurl4-openssl-dev and
+  # libcurl4-gnutls-dev which conflict; ignore the gnutls variant so
+  # the openssl variant is used consistently.
+  Ignore: libcurl4-gnutls-dev
+  # libgdal-dev and several of its deps use libjpeg-dev which is provided
+  # by both libjpeg62-turbo-dev and libjpeg-dev; prefer the turbo variant.
+  Prefer: libjpeg62-turbo-dev
+  %endif