diff --git a/x11/boomer/Makefile b/x11/boomer/Makefile
--- a/x11/boomer/Makefile
+++ b/x11/boomer/Makefile
@@ -33,7 +33,7 @@
 do-build:
 	cd ${BUILD_WRKSRC} && nimble build --nim=${LOCALBASE}/nim/bin/nim \
 	--nimcache:${WRKDIR}/.nimcache --localdeps --offline --reject \
-	--verbose -d:release -d:nimDebugDlOpen
+	--verbose -d:release -d:nimDebugDlOpen -d:mitshm
 
 do-install:
 	${INSTALL_PROGRAM} ${INSTALL_WRKSRC}/${PORTNAME} \
diff --git a/x11/boomer/files/patch-src_screenshot.nim b/x11/boomer/files/patch-src_screenshot.nim
new file mode 100644
--- /dev/null
+++ b/x11/boomer/files/patch-src_screenshot.nim
@@ -0,0 +1,26 @@
+--- src/screenshot.nim.orig	2025-05-03 08:20:45 UTC
++++ src/screenshot.nim
+@@ -6,10 +6,10 @@ when defined(mitshm):
+   # Stolen from https://github.com/def-/nim-syscall
+   when defined(amd64):
+     type Number = enum
+-      SHMGET = 29
+-      SHMAT = 30
+-      SHMCTL = 31
+-      SHMDT = 67
++      SHMGET = 231 
++      SHMAT = 228
++      SHMCTL = 512
++      SHMDT = 230
+ 
+     proc syscall*(n: Number, a1: any): clong {.inline.} =
+       {.emit: """asm volatile(
+@@ -42,7 +42,7 @@ proc newScreenshot*(display: PDisplay, window: Window)
+ 
+   when defined(mitshm):
+     result.shminfo = cast[PXShmSegmentInfo](
+-      allocShared(sizeof(TXShmSegmentInfo)))
++      allocShared(sizeof(PXShmSegmentInfo)))
+     let screen = DefaultScreen(display)
+     result.image = XShmCreateImage(
+       display,